https://www.mathworks.com/matlabcentral/answers/498803-readtable-giving-nan-for-some-data-files-txt, https://www.mathworks.com/matlabcentral/answers/498803-readtable-giving-nan-for-some-data-files-txt#comment_782787, https://www.mathworks.com/matlabcentral/answers/498803-readtable-giving-nan-for-some-data-files-txt#comment_783689, https://www.mathworks.com/matlabcentral/answers/498803-readtable-giving-nan-for-some-data-files-txt#answer_409005. sites are not optimized for visits from your location. Certainly, it's not clear what is confusing. Trapezoidal numerical integration in MATLAB Difference between Convolution VS Correlation How to add White Gaussian Noise to Signal using MATLAB ? NaN () . MathWorks is the leading developer of mathematical computing software for engineers and scientists. readmatrix produces NaN values after parsing a .txt file - MATLAB Answers - MATLAB Central readmatrix produces NaN values after parsing a .txt file Follow 239 views (last 30 days) Show older comments h_chep on 16 Apr 2020 1 Link Translate Commented: Luis Fernando Gutierrez Urzua on 26 Apr 2022 Accepted Answer: darova matrixA.zip Hi there guys, Matlab's readmatrix is trying to be smart and locate a 2-D matrix within the data model of the CSV file you're passing it. I produce several .txt files with emphemerides data in an orbital propagator software and want to work on the pos. This seems to do what you're asking, and hopefully will be enough to get you started: It would help to have your file, and a better understanding of what you intend to do with the matrix. https://www.mathworks.com/matlabcentral/answers/499974-readmatrix-with-numbers-and-text-from-csv-file, https://www.mathworks.com/matlabcentral/answers/499974-readmatrix-with-numbers-and-text-from-csv-file#answer_409763. Readmatrix returns NaNs until a certain number. 31,32,33,34,NaN,NaN,NaN,38,39,40 Readmatrix will now do . You may receive emails, depending on your. But now, it's not. For some reason, I could read the values where there is one single number but not the numbers with/within the brackets. However, what I can see is reasonable and expected number, so the problem is probably in the way how I set up readmatrix itself. Thanks! on 22 Oct 2020. readmatrix produces NaN values after parsing a. https://ch.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file, https://ch.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#comment_830373, https://ch.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#comment_831413, https://ch.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#comment_968668, https://ch.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#answer_427065, https://ch.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#answer_426781, https://ch.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#comment_831411, https://ch.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#comment_831428, https://ch.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#comment_2123795. The attched document of Re3750000.txt is one of the text files that is having this problem. The thing is that after parsing those .txt files with readmatrix() I receive weird NaNs in random places. offers. Find the treasures in MATLAB Central and discover how the community can help you! In R2018a and earlier, use the "isnan" function: A = [1,NaN,2]; B = A (~isnan (A)) 4 Link Translate You can you something like this Accelerating the pace of engineering and science. MathWorks is the leading developer of mathematical computing software for engineers and scientists. Thing is, when I started to manually check my .txt files, I found out that, there are no NaNs in txt files themselves. Unable to complete the action because of changes made to the page. I've encountered weird phenomena while working with readmatrix(). If you could edit this solution to an answer, I would gladly accept it as an answer. Choose a web site to get translated content where available and see local events and I want to have the numbers and the text into the matrix. In newer versions of matlab, it is recommended to use readmatrix but unfortunately, it has the same problem as readtable and doesn't support the 'MultipleDelimAsOne' option. These sequences represents the order in which data must be extract in other files. your location, we recommend that you select: . - nkjt Aug 7, 2013 at 16:36 Show 1 more comment 2 Answers Sorted by: 3 This will return the indices of your data that are supposedly NaN: I produce several .txt files with emphemerides data in an orbital propagator software and want to work on the position and velocity data further in Matlab. after every 60025 lines. Choose a web site to get translated content where available and see local events and 2. matlab matrix nan Share Follow MathWorks is the leading developer of mathematical computing software for engineers and scientists. For instance, for your convenience I will only provide matrixA with the least amount of NaNs, but there are other files where the number reaches up to 221, which after parsing results in 2 NaNs (see code section below). test.csv = 1,2,3,test a,b,5,6 7,asdf,8,9,d As can be seen this is a 3x4 matrix of numbers and text. Reload the page to see its updated state. The data in your txt file is separated using an irregular number of spaces. Try this, It works, but produces an extra column of NaNs somehow. Thank youv very much. I tried adding the line: T = readtable(fileName, 'TreatAsEmpty',{'. The lines are located regularly in the file at line numbers 207, 60232, 120257, etc., i.e. In MATLAB, import the data file contains the percentages of the population that have diabetes in each of the four provinces and also the country as a whole (excluding territories) for age groups 35 years of age and above. The difference between the two files is that the delimiter is default detected as {','} for file2.txt and detected as {'\t' ' '} for file1.txt. The code import them like: {12, 302.58, NaN, 5.8, NaN}. Unable to complete the action because of changes made to the page. https://www.mathworks.com/matlabcentral/answers/479120-readmatrix-function-excluding-non-numeric-value-if-first-on-last-in-vector-help, https://www.mathworks.com/matlabcentral/answers/479120-readmatrix-function-excluding-non-numeric-value-if-first-on-last-in-vector-help#comment_742708, https://www.mathworks.com/matlabcentral/answers/479120-readmatrix-function-excluding-non-numeric-value-if-first-on-last-in-vector-help#answer_390603. If for example I have raw data that reads . offers. Thank you for your solution! readmatrix returns NaNs instead of numeric. The Variable Names is in line 2. When I try to add the data manutally using Home>Import Data it works! In newer versions of matlab, it is recommended to use readmatrix but unfortunately, it has the same problem as readtable and doesn't support the 'MultipleDelimAsOne' option. However, note that dlmread is getting deprecated. I didn't have this problem in R2020a. The data in your txt file is separated using an irregular number of spaces. It looks like it's passing over the first few lines which don't have explicit trailing empty "cells". I produce several .txt files with emphemerides data in an orbital propagator software and want to work on the position and velocity data further in Matlab. your location, we recommend that you select: . I have a very large .csv file to read which contains text and numbers. that will return (optionally) the full raw cell values you can process. I deleted rows of the text file that does not import correctly and It started working when I deleted all rows after 19. sites are not optimized for visits from your location. I produce several .txt files with emphemerides data in an orbital propagator software and want to work on the position and velocity data further in Matlab. To explain I have a very simplified .csv file below called test.csv. MATLAB . Now the twist is that in some columns there are non-numeric terms such as 'n.a. Skip to content Cambiar a Navegacin Principal The thing is that after parsing those .txt files with readmatrix() I receive weird NaNs in random places. Learn more about readmatrix, nan MATLAB I will also attach an archived matrixA.txt for your convenience. For some data tables I am getting lots of NaN values. However, what I can see is reasonable and expected number, so the problem is probably in the way how I set up readmatrix itself. However, I can see that the correct values are being imported, they are just all out of position. Other MathWorks country Help me please. Turn a Matrix into a Row Vector in MATLAB 3D Plots in MATLAB How to plot a Histogram in MATLAB ? with your second file. Based on Find the treasures in MATLAB Central and discover how the community can help you! Learn more about readmatrix MATLAB Input Files The attached file1.txt and file2.txt have identical structure (9 lines of header followed by data arranged in 15 columns). I want this read by MATLAB and put into a matrix. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. If you could edit this solution to an answer, I would gladly accept it as an answer. The reason for it is that the provided "Range" values is limited, so rows outside of the Range are used to determine the format of a file to ensure the best result. Choose a web site to get translated content where available and see local events and You could also try find (isnan (data)) on the data you have read into matlab to find which values are turning into NaNs. I suppose you could do: Theme opts = detectImportOptions ('Re3750000.txt' 'Re3750000.txt' detectImportOptions The problem with readmatrix is that it cannot handle different datatypes. im importing data using readmatrix as this seems to be the only one that works for my purposes. your location, we recommend that you select: . example. your location, we recommend that you select: . So you need to use a talbe, a cell, or split the reading. Based on Can you give me any suggestion on how to deal with this NaN generation issue? Thing is, when I started to manually check my .txt files, I found out that, there are no NaNs in txt files themselves. readmatrix Read matrix from file collapse all in page Syntax A = readmatrix (filename) A = readmatrix (filename,opts) A = readmatrix ( ___ ,Name,Value) Description example A = readmatrix (filename) creates an array by reading column-oriented data from a file. Based on Thanks! readmatrix determines the file format from the file extension: .txt, .dat, or .csv for delimited text files. Unable to complete the action because of changes made to the page. When I try readmatrix('test.csv') I get the numbers but instead of text I get 'NaN'. There might be some issues fixed in this release. A = readmatrix (filename) creates an array by reading column-oriented data from a file. To explain I have a very simplified .csv file below called test.csv. I'm currently extracting sequences stored in a excel worksheet. For files containing mixed numeric and text data, readmatrix imports the data as a numeric array by default. how do I change this so that I can display a matrix shwowing: "placename = Meanrecyclingdata" as my code does not work. A = readmatrix (filename) . is stored in the middle of the vector, the function returns a 1x5 vector with a 'NaN' value in the middle or at the first position as shown below : However, if the number are stored in the other direction (as columns), the readmatrix() function ignores the 'n.a.' You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. Reload the page to see its updated state. A good start would be the function isnan (someVector). Other MathWorks country I produce several .txt files with emphemerides data in an orbital propagator software and want to work on the position and velocity data further in Matlab. Or indeed use dlmread. In that case it would be treated as a variable name field to be skipped. Find the treasures in MATLAB Central and discover how the community can help you! But the solution from. Learn more about readmatrix, nan, text file MATLAB Hi, In the following example, the only difference between . offers. This solution worked for me in R2021b. That will return a logical the same length as someVector true in the indices where someVector contains a NaN value. You may receive emails, depending on your. I want this read by MATLAB and put into a matrix. Theme Copy detectImportOptions (filepath); opts.DataLines= [1,Inf]; T = readtable (filepath,opts); I can read the file but the problem is that some of the variables are changing to NaT or NaN, is it possible to set on line 2 (where the variable names are located) to character before executing readable function? Based on After reading file i.e 'readmatrix' function, Nan can be replaced with zeroes or empty (''). Try this, It works, but produces an extra column of NaNs somehow. I produce several .txt files with emphemerides data in an orbital propagator software and want to work on the pos. For instance, for your convenience I will only provide matrixA with the least amount of NaNs, but there are other files where the number reaches up to 221, which after parsing results in 2 NaNs (see code section below). You may receive emails, depending on your. Reload the page to see its updated state. I just wanted to use readtable (as readmatrix can not be used since there are various types of data - it complains) to make it a bit simple rather than writing few more lines of codes. I start with a file called Re10000.txt and then Re20000.txt all the way to Re 20 million. Find the treasures in MATLAB Central and discover how the community can help you! Other MathWorks country This was previously working with an older set of .txt files but as I updated to a newer set of data I am getting some issues which I cannot find the problem of. MathWorks is the leading developer of mathematical computing software for engineers and scientists. offers. Readmatrix returns NaNs until a certain number of lines is reached in the text file. ', as for example in the '.xlsx' : When using the readmatrix() function on the first line, the 'n.a.' Choose a web site to get translated content where available and see local events and function Dat = importfile (filename, startRow, endRow) %IMPORTFILE Import numeric data from a text file as a matrix. 31,32,33,34,38,39,40 For some reason, it confuses readmatrix in a few rows. I suppose you could do: If all the files have the same number of columns, then you only need to do the, You may receive emails, depending on your. Other MathWorks country Unable to complete the action because of changes made to the page. The readmatrix function performs automatic detection of import parameters for your file. The readmatrix function performs automatic detection of import parameters for your file. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. Sometimes my data would have NaNs and readmatrix would import them and leave everything as it is. last_coord= (points-1)*60025+207; It works perfectly fine! ','NA'}); as seen in another post but that did nothing. Accelerating the pace of engineering and science. Reload the page to see its updated state. Find the treasures in MATLAB Central and discover how the community can help you! - Molly Aug 7, 2013 at 16:35 1 isnumeric counts NaN and Inf as numbers. Sudhakar Shinde on 22 Oct 2020. object to see if setting number of variables and type will help. offers. These two files are formatted in the same way. values stored first : Is there an logic behind this behavior or a way around this problem? The thing is that after parsing those .txt files with readmatrix () I receive weird NaNs in random places. I will also attach an archived matrixA.txt for your convenience. There might be some issues fixed in this release. routine, I expected to see smth weird in the txt file itself. Or, cleanup the Excel spreadsheet first by ensuring NaN numeric values or other missing value. I have written the code, that reads the specific lines: (points is number of measured points and name is name of measurement file) Theme. I produce several .txt files with emphemerides data in an orbital propagator software and want to work on the position and velocity data further in Matlab. Other MathWorks country It works perfectly fine! For instance, for your convenience I will only provide matrixA with the least . Based on You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. dpb on 6 Sep 2019 Try using the SpreadsheetImportOptions Otherwise, revert to or xlsread that will return (optionally) the full raw cell values you can process. A = readmatrix ( ___,Name,Value) creates an array from a file with additional options specified by one or more name-value pair arguments. Thank you for your solution! https://uk.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file, https://uk.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#comment_830373, https://uk.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#comment_831413, https://uk.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#comment_968668, https://uk.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#answer_427065, https://uk.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#answer_426781, https://uk.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#comment_831411, https://uk.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#comment_831428, https://uk.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#comment_2123795. The thing is that after parsing those .txt files with readmatrix () I receive weird NaNs in random places. Whatever it is it has to do with the space characters between each field. Choose a web site to get translated content where available and see local events and You may receive emails, depending on your. but since the first column is place names obviously matlab, when asked returns NaN. This solution worked for me in R2021b. The thing is that after parsing those .txt files with readmatrix() I receive weird NaNs in random places. Accelerating the pace of engineering and science. For some reason, it confuses readmatrix in a few rows. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. I have an iterative loop to put these tables into a cell called "Re". I've encountered weird phenomena while working with readmatrix(). Can you give me any suggestion on how to deal with this NaN generation issue? sites are not optimized for visits from your location. routine, I expected to see smth weird in the txt file itself. Learn more about readmatrix, nan MATLAB Hi there guys, I've encountered weird phenomena while working with readmatrix(). readmatrix produces NaN values after parsing a .txt file - MATLAB Answers - MATLAB Central readmatrix produces NaN values after parsing a .txt file Follow 281 views (last 30 days) Show older comments h_chep on 16 Apr 2020 Vote 1 Link Commented: Luis Fernando Gutierrez Urzua on 26 Apr 2022 Accepted Answer: darova matrixA.zip Hi there guys, I have about 6000 .txt data files that I wish to import into Matlab. You can control this by setting the import options. But I need to keep the value of these NaN cells. MathWorks is the leading developer of mathematical computing software for engineers and scientists. This becomes obvious if you try to concatnate a datetime-vector with a numerical matrix. But I cannot do that for over 6000 text files. Data were collected between 2015 and 2021: REF_DATE (year), GEO (country/province), Age group (35-49 years, 50-64 years, 65 . As can be seen this is a 3x4 matrix of numbers and text. Unable to complete the action because of changes made to the page. Learn more about readmatrix, nan MATLAB Hi there guys, I've encountered weird phenomena while working with readmatrix(). I didn't have this problem in R2020a. Accelerating the pace of engineering and science. When I try readmatrix ('test.csv') I get the numbers but instead of text I get 'NaN'. Reload the page to see its updated state. I've encountered weird phenomena while working with readmatrix(). All columns are of the same length, for exemple 5 elements. But the solution from. To me, this indicates there may be something with the formatting, but comparing this data file to one that is working, I can not identify anything that would make this import fail. A = readmatrix (filename,opts) additionally uses the import options opts. I have also attached Re3740000.txt because this text file is working and does not give me any NaN values. sites are not optimized for visits from your location. sites are not optimized for visits from your location. The problem is your last line has 5 columns. example. Thought could be: Create a data in csv sheet effectively without any empty field to not get Nan's. or. Features of MATLAB Mean Function in MATLAB Reduced Row Echelon Form (rref) Matrix in MATLAB Accelerating the pace of engineering and science. For example, consider the following: A = [1,NaN,2]; B = rmmissing (A) The result is the vector "B = [1 2]". Create array of all NaN values - MATLAB NaN Documentation More Videos Answers Trial Software Product Updates NaN Create array of all NaN values collapse all in page Syntax X = NaN X = NaN (n) X = NaN (sz1,.,szN) X = NaN (sz) X = NaN ( ___ ,typename) X = NaN ( ___ ,'like',p) Description X = NaN returns the scalar representation of "not a number". To try and reproduce this chang "start" to 374000 and "finish" to 375000 and store the files in a folder called "Renamed NACA0018". As an example, >> isnan (P (1,:)) ans = [0 0 0 0 0 0 1 1] >> notNaN = ~isnan (P (1,:)); >> P (1,notNaN) ans = [1 6 7 3 2 1] That's a way to ignore NaN values. As there are empty fields within your csv file, MATLAB read it as NAN (not a number). I want to extract the numbers only. When using the readmatrix () function on the first line, the 'n.a.' is stored in the middle of the vector, the function returns a 1x5 vector with a 'NaN' value in the middle or at the first position as shown below : Theme Copy readmatrix ('Example.xlsx','Sheet','Feuil1','Range','A1:E1') ans = 1 2 NaN 4 5 Go to matlab r/matlab . For instance, for your convenience I will only provide matrixA with the least . ColName = 'A1'; DataInColumn = find (strcmp (Header,ColName)); DataInColumnRaw = data (2:end,DataInColumn ); A part of data in this column is: {12, 302.58, V45.7, 5.8, E111.87}. Starting in R2018b, you can use the "rmmissing" function to remove "NaN" values from an array. readmatrix ('Example.xlsx','Sheet','Feuil2','Range','E1:E4') ans = 1 2 3 NaN Is there an logic behind this behavior or a way around this problem? your location, we recommend that you select: .
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