reducing decimals and using as string

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Reza S
Reza S 2015-3-6
评论： Reza S 2015-3-6
Hello,
I am going to truncate or round the decimals of a variable to the maximum of 2 decimal and then use num2str to shown the resulted number on a plot title. I am getting the error message when I use round()? Also I am not sure how to use fprint in this case. Any body can help please or any better solution?
Thanks
  1 个评论
Jan
Jan 2015-3-6
Please post the error message and the code. Obviously there is a bug.

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Stephen23
Stephen23 2015-3-6
编辑：Stephen23 2015-3-6
You do not need to use round, as num2str already has a precision option:
>> num2str(pi,2)
ans = '3.1'
You could also use sprintf which converts a number to string and gives control over many format options, including the number of significant digits:
>> sprintf('%.2g',pi)
ans = '3.1'
If you are trying to use this in a plot title, than using fprintf will not help you: fprintf prints text to a file or the command window. If you want the title of a plot then you need a string and the title function, like this:
>> str = num2str(pi,2)
>> title(str)

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