Saving images inside a loop with changing filename

Dear Community, in a similar situation I would like to save images inside a loop. I do not know why there is an invalid character error in the filename. The filename should look like: actual foldername, Roi and a number.

Please share your suggestions:

Best:

lg

I=rand(20,20);
[~,fo{1,1},~]=fileparts(pwd);
for i=1:10
 index=i
 imwrite(I,'[ fo{1,1} '_' 'Roi' '_' num2str(index)].tiff')
end

Answer 1

[Matt J]

I=rand(20,20);
[~,fo{1,1},~]=fileparts(pwd);
for i=1:10
 index=i
 imwrite(I,   fo{1,1}  + "_Roi_" +  index  + ".tiff"   )
end

Answer 2

[Walter Roberson]

 imwrite(I,'[ fo{1,1} '_' 'Roi' '_' num2str(index)].tiff')

Invalid text character. Check for unsupported symbol, invisible character, or pasting of non-ASCII characters.

You start a character vector. The first character of the vector is the '[' character. The second character is space. The third character is 'f' then 'o' then '{' then '1', ',', '1', '}' then space. You then end the character vector. After that you have an underscore immediately after the end of the character vector . But the underscore is not part of a variable name and is not a valid variable name by itself, and underscore is not a valid operator name. The underscore is invalid there.

I suggest you use

 filename =  fo{1,1} + "_Roi_" + index + ".tiff"
 imwrite(I, filename)

[Levente Gellért]

Dear Walter Robertson, thanks for the detailed explanation! Best lg