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How can I obtain my expected result?

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Sabid Hossain
Sabid Hossain 2020-6-2
编辑： claudio 2020-6-2
I typed this code
function out=picker(c,in1,in2)
if c
out=fprintf('%d\n'in1);
else
out=fprintf('%d\n'in2);
end
my desire was to get this reslut
>>out=picker(true,5,6)
out=5
>>out=picker(false,5,6)
out=6
but matlab found a bug here .What is wrong with my code and how can I obtain my expected result?

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采纳的回答

claudio
claudio 2020-6-2
It depends on what type of outcome you need. If you need numeric out
function out = picker(c,in1,in2)
out = in2;
if c, out = in1; end
If you need char outcame
function out = picker(c,in1,in2)
out = sprintf('out = %d',in2)
if c, sprintf('out = %d',in1); end
  2 个评论
Sabid Hossain
Sabid Hossain 2020-6-2
Thank you for you help.I have tried your code by myself and got my desired result.But when I use 'fprintf' instead of 'sprintf' I've got different result.
out = picker(true,4,5)
out = 5
out =
7
out = 4
out =
7
I thought sprintf and fprintf work alike. But when I use fprintf, in result "out = 7" comes out of nowhere. What is the reason behind this?
claudio
claudio 2020-6-2
编辑：claudio 2020-6-2
https://www.mathworks.com/help/matlab/ref/fprintf.html
https://www.mathworks.com/help/matlab/ref/sprintf.html
sprintf allows to format data into string. fprintf (with that syntax) returns the number of characters (as Image Analyst said)

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更多回答（2 个）

David Hill
David Hill 2020-6-2
function out=picker(c,in1,in2)
if c
out=in1;
else
out=in2;
end
fprintf('out=%d',out);
Image Analyst
Image Analyst 2020-6-2
fprintf() returns the number of characters printed, which is not what you want. What you want is this:
function out = picker(c, in1, in2)
v = [in1, in2];
out = v(c+1);

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