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Jeremy Hughes


Last seen: 1 day ago

MathWorks

104 total contributions since 2015

Software Developer, Musician and Science Fiction Writer.

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Answered
using spreadsheet column headers as variable
When you create import options from scratch, you need to specify all the information, including where the variablenames and data...

6 days ago | 0

Answered
Error using readmatrix - Unable to determine range. Range must be a named range in the sheet or a single cell within 'XFD1048576'.
'Range' also accepts numeric inputs [r1 c1 r2 c2], the drawback being you need to specify the columns. You can specify only the...

23 days ago | 0

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Answered
Using writetable to create a text file
WriteMode is available in R2020a. What version are you using?

1 month ago | 0

Answered
How to change the date format of ,txt file?
https://www.mathworks.com/matlabcentral/answers/516121-how-do-i-specify-a-datetime-format-when-reading-a-csv-excel-file

2 months ago | 0

| accepted

Answered
Errors using xlsread to import data from Excel
Sometimes the Excel instalation can break xlsread, there shouldn't be a reason MATLAB install changed anything for you. It might...

2 months ago | 1

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Answered
how to check whether a sheet exists or not, while using readtable function
I don't know if it's any better, but there is https://www.mathworks.com/help/matlab/ref/sheetnames.html Otherwise, try/catch mi...

3 months ago | 1

Answered
Error in XML file
You could try fid = fopen(fname); bytes = fread(fid); fclose(fid); find(bytes==1) If that doesn't find anything, then it ma...

4 months ago | 0

Answered
Does MATLAB add extra data to text files?
I'd check the new line characters "\r" isn't typically used for a new line in most modern environments. It may be that the tex...

4 months ago | 1

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Answered
textscan does not read all rows
If you pass in 'ReturnOnError',false with the textscan call, there will be an error message where the format cannot read your fi...

4 months ago | 0

Answered
readtable skipping some rows
detectImportOptions detecting Space as the delimiter, (correctly I think) and is looking at the "N/A" and "NE 45" and treating t...

5 months ago | 0

Answered
Read text file with multiple rows of fields
The current best way I know how to do this is with TEXTSCAN. fmt = "%s%s%s%s%*[^\r\n]%*[\r\n]%s%s%s%s" fid = fopen('sampleFile...

6 months ago | 1

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Answered
Problems with readtable within parfor on R2018b for Win 64
Try using READTABLE with the 'UseExcel',false parameter. (This might also be 'Basic',true in older releases.)

7 months ago | 0

Answered
First colum of CSV-imported table has "x___" added to its name
The file probably has a Byte Order Mark in the beginning. If you read the raw bytes using fopen/fread you can see the mark at ...

7 months ago | 2

Answered
How can I increase the speed of this loop?
It's hard to say without looking at the contents of the file's you're reading. You're overriding n in the for loop with n as th...

7 months ago | 0

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Answered
textscan with formatted input data
This should be able to read this without much issue. opts = detectImportOptions(filename) T = readtable(filename,opts)

8 months ago | 0

Answered
How to read specific numbers (colums) of a csv file
I'd do this: opts = detectImportOptions(filename); opts.SelectedVariableNames = opts.VariableNames([3 4]); T = readtable(file...

8 months ago | 0

Answered
Read a very large .csv file, split into parts and save each part into a smaller .csv file
If your plan is to write all the small CSV files out, and do nothing with them in MATLAB, I'd say just use tabularTextDatastore,...

8 months ago | 0

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Answered
Read a specified list of images given the filename and the directory the files are in
Datastores are convenient for reading collections of files. imds = imageDatastore(directory) imshow(read(imds)) Each time you...

9 months ago | 0

Answered
Readtable for a huge (no good schema) CSV file!
opts = detectImportOptions(FileName,'Delimiter',';','NumHeaderLines',18) T = readtable(FileName,opts)

9 months ago | 0

Answered
readtable not understood behaviour
A simpler way to do this would be: lines = splitlines(fileread(filename))

9 months ago | 0

Answered
Readtable from i-th row to last row
Try this opts = detectImportOptions(filename,'NumHeaderLines',6) T = readtable(filename,opts)

9 months ago | 1

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Answered
Readtable() confused by quotation marks? Matlab 2019a
opts = detectImportOptions('myfile.txt','FileType','text','Delimiter','|') T = readtable('myfile.txt',opts)

9 months ago | 0

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Answered
How to read in a non-standard formated CSV file containing times and measurments and change the output format?
You could do this with textscan fid = fopen(file); vars = textscan(fid,'TIM%f%fABC%fDEF%fGHI%f','Delimiter',{','},'Whitespace'...

10 months ago | 0

Answered
readData() function error message when using mapreduce
ds.TextscanFormats{15} = '%q' That will at least get you past the one line that's causing the problem here. For a more robust a...

10 months ago | 0

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Answered
Why writetable() adds ' 'true ' table element as ''table?
I think this is a case where using strings would make things more clear. In MATLAB, if I create a char vector and put a single-...

10 months ago | 0

Answered
Set union of Datastores with TransformedDatastores
Horizontal (i.e. associated reads) ----------- cds = combine(imds,otherds); Vertical (i.e. joining two sets of files into o...

10 months ago | 1

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Answered
MATLAB 2018a readtable VariableNamesLine bug
What is the result if you pass ReadVariableNames into the function? T = readtable(fullFileName, opts, 'ReadVariableNames', true...

11 months ago | 1

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Answered
Matlab Compiler not updating text file
There may be another text file with the same name on your path. Try, which -all <filename>.

12 months ago | 0

Answered
problem reading with format
The leading spaces are not being counted toward the width of the fields as you're expecting. %n.pf - will read at most n charac...

12 months ago | 0

Answered
Loading/Reading .log File
Try this: data = readtable('omar_timing_test_MG125_Block_1.log','FileType','text') Jeremy

12 months ago | 0

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