fprintf command output and extra output

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Jack Crespo
Jack Crespo 2019-4-22
评论： Jack Crespo 2019-4-23
I am trying to change a sound file to ouput an echo.I have to output a column vector of size [4 1]. My output is:
output=echo_gen([-.5;0;.5;0],1,0,.5)
output =
-0.7500
0
0.7500
0
However, this is incorrect. I think it needs to be outputing like this:
output=echo_gen([-.5;0;.5;0],1,0,.5)
output =
-0.75
0
0.75
0
I tried using the fprintf('%g',output) and fprintf('%.2f',output) to remove the trailing zeros, but when i do that, i get this:
output=echo_gen([-.5;0;.5;0],1,0,.5)
-0.75
0
0.75
0
output =
15
Where is the output=15 coming from, and how do i remove it to get only the colum vector?
Thanks in advance.

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采纳的回答

Stephen23
Stephen23 2019-4-22
编辑：Stephen23 2019-4-22
You used the wrong operator. If you want to print to string, use sprintf.
"Where is the output=15 coming from..."
The fprintf documentation clearly describes that its only output is "Number of bytes that fprintf writes, returned as a scalar", which in your case also corresponds to characters on each line: 5 + 1 + 4 + 1 + 4(newlines) = 15.
"...and how do i remove it to get only the colum vector?"
Just suppress the function output using a semi-colon:
output=echo_gen(...);
^ you need this!
But as mentioned at the start of my answer, I suspect that you really want to be using sprintf, not fprintf, as you indicate that you want to print text to an output argument.
  1 个评论
Jack Crespo
Jack Crespo 2019-4-23
Thanks Stephen! Im a junior in high school, and i am taking an online course, and this was one of the assignments. I actually was doing part of the problem incorrectly, and i needed to add some more logic in my code to get it working. But your explanation of fprintf and sprintf cleared up a lot of confusion I had, so thank you very much!

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