sprintf or disp

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AP
AP 2011-6-17
I have a question on the application and performance of disp and sprintf. Which one is recommended? For example, what is the difference between the following?
disp(['this is a test number: ' 12])
and
sprintf('this is a test number: %d', 12)

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回答（3 个）

Krishna Kumar
Krishna Kumar 2011-6-17
disp displays the string or variable in the command windoe, whereas sprintf can be used to output the result into a variable, GUI ,file etc
Robert Cumming
Robert Cumming 2011-6-17
As well as being more flexible, sprintf is also much faster than disp when joining strings together like you have shown.
for writing to the command window I normally use fprintf. This also allows you to write your own error/warning/information messages:
fprintf ( 2, 'my error(warning) message in RED!\n' );
The number 2 signifies that you want to write to the command window in red font.
Walter Roberson
Walter Roberson 2011-6-17
The first of the two prints out the quoted string followed by a newline (character 12).
The second of the two prints out
ans =
this is a test number: 12
sprintf() is much more flexible for formatting numbers and strings, but is not able to handle objects.
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Walter Roberson
Walter Roberson 2011-6-17
For example, you can disp() a structure or a cell array, but sprintf() has no built-in ways to handle those.
Walter Roberson
Walter Roberson 2011-6-17
Also note you can get rid of the "ans =" if you use fprintf() instead of sprintf() .

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