Jeremy Hughes

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MATLAB system command bug - returns partial stdout
Very late to the story here, but there was a bug in the linux kernal that affected the system command in this way. https://www.m...

2 months ago | 0

Answered
Readtable is not reading my delimiter and datetime columns correctly
Passing in the delimiter is the right thing to do. The detectImportOptions function (which is being called by readtable) tries t...

5 months ago | 0

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Is it possible to decide which line is variable names in readtable?
You can try: readtable(filename,"NumHeaderLines",2) or opts = detectImportOptions(filename) opts.VariableNamesRange = "A3"...

5 months ago | 0

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filedatastore; read M mat files of size (1xL) into single tall array that is of size (1, L*M)
In general, you'll have better luck identifying where the problem lies by looking at each piece of the code separately. fcn = @...

7 months ago | 1

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Help with code, writematrix not working. Please help fix
The error reffers to mpower.m being a script and not a function. mpower is a builtin function, and mpower.m contains only help t...

7 months ago | 0

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Export arrays to excel
If each variable is 1x5000 then your original code is creating a 1x35000 block of data when you put it in the table. This is val...

8 months ago | 0

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fwrite and MATLAB for a raid0 disk - Only one lane?
I was playing around with this and found that this is much faster (by a factor of 3 on my machine): fwrite(fid,data(:),"double"...

8 months ago | 0

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Reading .txt file in MATLAB with issue in formatting
The issue is that \" is not how CSV files (and thus readtable) escape doube-quotes. To escape quotes, the file should have "". ...

9 months ago | 0

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Export data to specified excel rows using writematrix
I believe it should be possible to do this using (almost) the syntax you tried, and there are some suggestions in the comments, ...

10 months ago | 0

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How can I identify the maximum value in a column and then grab specific cells in the same row as that value?
Sounds like, in MATLAB table nomenclature, you want to find the row of the table that contains the maximum value of a particular...

10 months ago | 0

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Answered
"Unable to find or open 'Filename.txt'" error in MATLAB 2022a for files from a shared network drive.
Try first >> cd Z:\Groups\Smith_G\Ryan Poland\MultiPAS-IV\Data\NO2 Calibration\20210930 If that works, then you can either ad...

10 months ago | 0

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Answered
File Extensions Name-Value pair error
The issue is that .csv isn't a supported spreadsheet format. Many people associate csv with spreadsheet, and that's likely due t...

12 months ago | 0

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Create a datastore from a table
I had no issue with arrayDatastore taking a table. Could you share some sample code with the errors or problems you're seeing? ...

12 months ago | 0

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How to use textscan with empty char fields
The format specifier %c always reads one character, no matter what that character is. What you likely want it %s, which reads al...

1 year ago | 1

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Answered
Convert serial number date in date string - Excel file
First, I would suggest using readcell if you want to get datetimes. This will give you the right thing by default. Otherwise, c...

1 year ago | 0

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readmatrix not working in 2021b
I agree with the previous answer, but readmatrix is probably not what's being shadowed. It's probably something readmatrix relie...

1 year ago | 0

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how to read mixed date and data
I made some corrections in the comments above, but this is how I would do this more robustly using partial detection with detect...

1 year ago | 0

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use of readtable to read unstructured data
Based on the file attached, I suggest treating this as a fixed width file. opts = detectImportOptions("sample.txt","FileType","...

1 year ago | 0

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How to delete multiple rows from a table using a for loop (with a condition)?
I wouldn't use a for loop. MATLAB excells at array operations. A = randn(12,5); % Make some data with positive and negative v...

1 year ago | 0

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Answered
Why are there a few bytes added every time I call writetable?
writetable write "into" a sheet by default. And there's some meta-data being added, but I'm not sure if it's MATLAB, or the exce...

1 year ago | 0

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Answered
Unable to detect datetime or duration data in file for row times
Hi Sangani, This is a consequence of how Excel stores "time" data. It represents it as a "number" internally, with a custom for...

1 year ago | 1

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Answered
{0*0 char} error while Importing .dat file
Instead of readtable and table2array, you could instead use readmatrix (as of R2019a) directly. The reason some of the columns...

1 year ago | 0

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Answered
readmatrix command not working
This looks like an installation issue to me. Something is missing/broken causing initialization error in the internal code. Doe...

1 year ago | 0

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Reading .txt with multiple delimiters
Readtable accepts multiple delimiters. Try this: T = readtable(filename,"Delimiter",[" ","|"])

1 year ago | 0

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readtable not reading logical values as expected
The default results of detectImportOptions seeing "1" & "0" will be numeric, and the default logical reading expects "true","t" ...

1 year ago | 1

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Answered
why "writetable" replaces points with commas ???
@Walter Roberson, @Peter PerkinsYou're both right. Walter is more right. An XLSX file is a zip file containing XML data which ...

1 year ago | 0

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Importing 4D Excel data sets
You might try readcell. It will at least give you all the data. You will have to restructure it to get the format you'd like.

1 year ago | 0

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Program architecture for handling large .csv files
First, it would help to see an example file, and some sample code that demonstrates the problem. Here's the best I can say wit...

1 year ago | 0

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how to use setvartype on a table that is already existing
This will do what you're literally asking for. T = array2table(strings(200,0)) % 200 variables, 0 rows, all string type But I ...

1 year ago | 0

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Answered
Problem with readtable MATLAB R2020a+
My best guess is that there's something installed on the path that conflicts with a function//variable that readtable is using i...

1 year ago | 0

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Jeremy Hughes

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