Jeremy Hughes

Last seen: 11 days ago | Active since 2015

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MATLAB For-Each
Tools for simplifying for-loops. Customizable loop iteration.

4 months ago | 2 downloads |

Answered
unexpected writetable and readtable behavior
I think part of this is that the table looks like this: T1 = cell2table({[1 2 3], 2}) Where most tables look like: T2 = table...

7 months ago | 0

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writestruct does not reproduce the input of readstruct
Unfortunately, there's no way to get that to happen 100% of the time, and readstruct/writestruct are not meant to do that. In fa...

10 months ago | 0

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xlsread error in 2018b
xlsread uses an active Excel process on windows and has different behavior entirely on other platforms (or if excel isn't instal...

10 months ago | 0

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Repeat writing to Excel workbook on OneDrive causes "You may not have write permissions or the file may be open by another application" error.
One Drive is syncing files to the cloud when they are updated--it locks those files when that happens so you can't write to it f...

10 months ago | 1

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I want to export data to txt file in Loop
If you want to write the data to one file, this should work for i=1:N data = readtable(files(i).name); % Assuming you...

10 months ago | 0

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Problems reading datetimes with readtable
There is a slight issue with the file format in question. The second case looks to readtable like three columns if you choose sp...

11 months ago | 0

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Nonstandard input date format into readstruct function?
I believe this is a bug. I've created a bug report internally. Thanks.

12 months ago | 0

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Importing Excel Database Into MATLAB
This issue is in the call to readtabkle test = readtable('./dataset2.xlsx','Sheet','Sheet1','Range','A2:CA26','TreatAsEmpty',{'...

12 months ago | 0

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formatstring error when using tabularTextDatastore
Turns out this was a bug in R2020a and is been fixed in R2020b. See: https://www.mathworks.com/support/bugreports/2263913 You c...

12 months ago | 0

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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...

1 year ago | 0

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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...

1 year 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"...

1 year 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 = @...

1 year ago | 1

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Answered
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...

1 year 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...

1 year ago | 0

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Answered
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"...

1 year 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 "". ...

2 years 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, ...

2 years 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...

2 years 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...

2 years 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...

2 years 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? ...

2 years 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...

2 years ago | 1

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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...

2 years 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...

2 years 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...

2 years 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","...

2 years 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...

2 years 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...

2 years ago | 0

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Jeremy Hughes

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