Make num2str in engineering format

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Yoav Romach
Yoav Romach 2014-3-6
回答： Steven Lord 2021-11-22
Hey, I'm writing this code:
disp(['Cutoff frequency: ',num2str(wcutoff,'%e')]);
and this displays the frequency in an normal exponential format, but I want it to be in eng format. This means that instead of:
5.2e10
I want it to show:
52.0e9
Is that possible? A possible workaround could be to use "format shortEng" and than separate the display code into 2 lines, but than I need to find a way that it'll display it in one output line or something like that...

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Yoav Romach
Yoav Romach 2014-3-7
编辑：Yoav Romach 2014-3-7
Ok, I've actually came up with a better, simpler solution:
format shortEng
disp([' Cutoff frequency: ', strtrim(evalc('disp(wcutoff)'))]);
strtrim is needed because the evalc returns numerous leading and trailing white space, but this produces exactly the output I wanted, without the helper function.
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Yoav Romach
Yoav Romach 2014-3-7
Haa, I see, Don't care about the credit though.
My original problem with "format shortEng" was that it didn't work :) I had to push another "evalc('disp(wcutoff)')" inside, and I only thought of that today.
Thanks a lot anyway!

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更多回答（3 个）

Steven Lord
Steven Lord 2021-11-22
Ran in:
If you're using release R2021a or later I would use formattedDisplayText instead of evalc.
wcutoff = 5.2e10;
t = formattedDisplayText(wcutoff, 'NumericFormat', 'shortEng')
t =
" 52.0000e+009 "
Harry Dymond
Harry Dymond 2019-7-16
For the benifit of those stumbling across this old thread in search of answers: my FEX submission num2eng will do what the OP is asking for.
Jos (10584)
Jos (10584) 2014-3-7
A similar effect can be obtained by manipulating the string rather than the numbers
X = 52346574 ;
s1 = sprintf('%.2e',X)
v = sscanf(s1,'%d.%de%d')
s2 = sprintf('%d%.1fe%02d',v(1), v(2)/10, v(3)-1)
disp(['Cutoff frequency: ', s2]);
Which can be made into a function handle:
Val2EngString = @(X) sprintf('%d%.1fe%02d',[1 .1 1] .* sscanf(sprintf('%.2e',X),'%d.%de%d').' - [0 0 1])
disp(Val2EngString(2340000000))

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