why is a blank ignored in strcat

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Ross
Ross el 15 de Oct. de 2013
Comentada: Jos (10584) el 15 de Oct. de 2013
as an example, the following code:
strcat(num2str(1,'%02.0f'), '-', num2str(2), ' ', num2str(3), ':', num2str(4,'% 2.0f'))
produces:
01-23:4
whereas I want:
01-2 3: 4
Seems pretty simple but ... would someone help please?

Respuesta aceptada

Jan
Jan el 15 de Oct. de 2013
Editada: Jan el 15 de Oct. de 2013
'% 2.0f' adds a leading space on demand only, so you want: ' %2.0f'.
But this would be nicer, faster and less confusing:
sprintf('%02.0f-%d %d: % 2.0f', 1, 2, 3, 4)
To get around this ugly space gimmicks, which come from the backward compatibility to times before cell strings have been invented, I'm using a dedicated function to join strings: FEX: CStrCatStr. But this is designed for cell strings and for strings horzcat works sufficiently without deleting spaces smartly.

Más respuestas (2)

Friedrich
Friedrich el 15 de Oct. de 2013
Hi,
the doc states:
"For character array inputs, strcat removes trailing ASCII white-space characters: space, tab, vertical tab, newline, carriage return, and form-feed. For cell array inputs, strcat does not remove trailing white space."
So you can use:
strcat({num2str(1,'%02.0f')}, {'-'},{num2str(2)}, {' '}, {num2str(3)}, {':'}, {num2str(4,'% 2.0f')})
or dont use strcat and use []:
[num2str(1,'%02.0f'), '-', num2str(2), ' ', num2str(3), ':', num2str(4,'% 2.0f')]
  4 comentarios
Image Analyst
Image Analyst el 15 de Oct. de 2013
I was talking to Ross. I know Frederich knows both methods and I agree with you about why Frederich answered that way. I was trying to point Ross towards the method that I find gives me much more control with much less complicated syntax.
Jan
Jan el 15 de Oct. de 2013
@Image Analyst: I've inserted "@Ross" in your comment and have removed by concerning question.

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Jos (10584)
Jos (10584) el 15 de Oct. de 2013
Editada: Jos (10584) el 15 de Oct. de 2013
This used to be my workaround for the way strcat handles spaces:
strrep(strcat('AAA', '#SPACE#', 'BBB'),'#SPACE#',' ')
  2 comentarios
Jan
Jan el 15 de Oct. de 2013
What about: ['AAA', ' ', 'BBB'] ?
Jos (10584)
Jos (10584) el 15 de Oct. de 2013

I should have stressed the word used ...

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