Custom output of the fprintf

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Is there any way to use fprint with an exponential output field (e) for example:
%15.2e
and not get an output such as 3.00e-05 but 30.00e-06? Thank you

采纳的回答

José-Luis
José-Luis 2013-2-8
编辑:José-Luis 2013-2-8
Here is a small script to do what you asked for:
val = -0.0000001245332; %for example
tempVal = abs(val);
orderOfMag = floor(log10(tempVal));
if val == 0
orderOfMag = 1;
end
offset = 1 - orderOfMag; %Here you can change the number of digits to the left of the point. for three replace one by two, e.g.
valueToPrint = val.*10.^offset;
precision = 6; %number of display digits
expPrecision = 3; %number of digits in the exponent
if orderOfMag > 0
formatStr = ['%0' num2str(expPrecision) 'i'];
else
formatStr = ['-%0' num2str(expPrecision) 'i'];
end
your_string = [num2str(valueToPrint,precision)...
'e' ...
sprintf(formatStr,abs(orderOfMag-1))];
  2 个评论
Giorgos Papakonstantinou
Thank you for providing me with this script Jose. It is very helpful!

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更多回答(1 个)

Image Analyst
Image Analyst 2013-2-8
That does not seem to be one of the format specifier options built in. See formatSpec section of the fprintf() help documentation. It would be nice if it were though. I've seen other programs where you can specify "Scientific notation" where the exponent can be any number, and "Engineering Notation" where the exponent is a multiple of 3.
  2 个评论
Giorgos Papakonstantinou
编辑:Giorgos Papakonstantinou 2013-2-8
Thank you. I was searching in the documentation for a long time and I thought I wasn't searching quite enough!
Image Analyst
Image Analyst 2013-2-8
You can send a request for enhancement to support@mathworks.com.

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