I wanna create a txt file and assign data from matlab variables into this file. The point is I wanna create txt file without opening any file like in the case of "save as" in world or excel. I also want that user can choose directory and file name.

for example,

p = rand(5, 3)

startingFolder = 'C:\Program Files\MATLAB'

if ~exist(startingFolder, 'dir')

    startingFolder = pwd
end

defaultFileName = fullfile(startingFolder, '*.txt*')

[baseFileName, folder] = uigetfile(defaultFileName, 'Select a file')

if baseFileName == 0

    return
end
fullFileName = fullfile(folder, baseFileName)

save(fullFileName, 'p', 'q', '-ASCII')

in here, I want that users don't have to need to open any file before saving data into this file , like in the "save as". So users would choose path and file name in the same dialog box once, then file would be saved directly without creating a blank txt file before.

Answer 1

[Iain]

Change uigetfile to uiputfile.

[sermet]

it gives error "Unable to write file C:\Users\Hp\Desktop\xxx.txt*: Invalid argument."

error in uisave_deneme (line 15)

save(fullFileName, 'p', 'q', '-ASCII')

[Iain]

Is the selected filename C:\Users\Hp\Desktop\xxx.txt* ? The * will cause issues.

[sermet]

ok I removed * but how can I eliminate exponential display in txt file

[Iain]

A quick hack would be:

 fullFileName(fullFileName == '*') = [];

I think you have an extraneous * in your default file extension, if you remove that, it ought to work.

[sermet]

thank you Lain, finally could you tell me how can I eliminate exponential display in txt file?

[Iain]

I'm not sure you can using "save".

I'm not sure what you're really aiming for, but "dlmwrite", "csvwrite", and "xlswrite" are probably better suited to outputting nicely formatted text.