how to print E formated numbers.

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Pappu Murthy 2018-3-8

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评论： Star Strider 2018-3-8

I have numbers such as 0.1032E-02 (say) If I read this as x = 0.1032E-02 and save it to a text file using fopen, and fprintf fid = fopen('Testing.txt','wt'); fprintf(fid, '%15.5E\n',x) it always prints x as 1.032E-03 but I would like the 0 in front just as the way I assigned the value to x. How do i do it?

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Stephen23 2018-3-8

编辑：Stephen23 2018-3-8

@Pappu Murthy: Numeric data classes do not store any formatting, so printing a number "just as the way I assigned the value to x" is not possible in general: a value will simply be displayed according to the fprintf specification. With that in mind: if you need to convert to numeric, do you always want a leading zero in the printed output?

Pappu Murthy 2018-3-8

Yes. I want the numbers printed as 0.0000E-nn format with leading zero. But fprintf does not let the leading zero.

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Star Strider 2018-3-8

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Try this little utility anonymous function I wrote a while back to solve this exact problem:

a = 0.1032E-02
expstr = @(x) [x*10.^floor(-log10(abs(x)))  floor(log10(abs(x))+1)];
Result = sprintf('%.7fE%+03d', expstr(a))
Result =
    '0.1032000E-02'