Fprintf not inserting new line correctly with /n

I have a loop and part of it includes displaying text in the command window only, I don't need to export the string.

I've tried different positions of using /n in fprintf but I can't seem to get it to work properly. After the whole text string, I need a line break. I've also tried \r and \n together, but I get the same results. I assume I'm missing something obvious. I'm not quite sure where the /n is supposed to go.

Using disp and sprintf works as intended, as an example of what I want it do to.

% assign variable
InputFolders = [1 1 1];

% disp and sprintf works as intended
disp(sprintf("%s","Length of input and output folders match (",num2str(length(InputFolders)),")"))
disp(sprintf("%s","Length of input and output folders match (",num2str(length(InputFolders)),")"))

%%
% No \n included
fprintf("%s","Length of input and output folders match (",num2str(length(InputFolders)),")")
fprintf("%s","Length of input and output folders match (",num2str(length(InputFolders)),")")

%%
% \n on end - the \n is printed, presumably because I have %s at the start reading it as text
fprintf("%s","Length of input and output folders match (",num2str(length(InputFolders)),")\n")
fprintf("%s","Length of input and output folders match (",num2str(length(InputFolders)),")\n")

%%
% \n at start - gives a new line, but after every part of text, not at the end of the string
fprintf("%s\n","Length of input and output folders match (",num2str(length(InputFolders)),")")
fprintf("%s\n","Length of input and output folders match (",num2str(length(InputFolders)),")")

Answer 1

[per isakson]

The documentation of fprinf says

fprintf(formatSpec,A1,...,An) applies the formatSpec to all elements of arrays A1,...An in column order, and displays the results on the screen.

For every A1,A2,...,An the formatSpec should (typically) contain one Formatting Operator (or the formatSpec is reused).

Example

fprintf("%s\n","Length of input and output folders match (", "3" ,")")

The formatting operator, "%s\n", is reused three times: for "Length of input and output folders match (", for "3" and for ")" You intended (I guess)

fprintf( "Length of input and output folders match (%d)\n", 3 )

which outputs

Length of input and output folders match (3) 

[BC]

Thanks - this works, need to make sure I read the documentation better next time! Interesting that the disp and sprintf method doesn't work for you, it does display the number for me at least, but I prefer using this fprint method as it's neater.

[per isakson]

"Interesting that the disp and sprintf method doesn't work for you" Indeed it does. I firstly replaced (too save on line length) num2str(length(InputFolders)) by 3 (which didn't work). With "3" it works.

[BC]

Ok that makes sense - simiarily, with using your fprintf solution, instead of (%d) it should be (%s) if using my original line, as it's a string from num2str, not just a number. Just in case anyone else looks at this post :)