how can I change the number of digits before decimal point?
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Riyadh Muttaleb
on 10 Sep 2018
Commented: Steven Lord
on 19 Apr 2022
Hi everyone,
I would like to change the number of digits before the decimal point, for example 1.45237E+6 to 145.237E+4
Thanks in advance,
Riyadh
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Accepted Answer
Stephen23
on 10 Sep 2018
Edited: Stephen23
on 11 Sep 2018
Hmm, interesting problem. Here is one solution that lets you specify how many leading digits you want before the decimal point, before converting to char vector/string:
>> N = 1.45237E+6;
>> D = 3; % digits before decimal point
>> T = 6; % total digits
>> K = 10^(2-D+floor(log10(N)));
>> sprintf('%d%.*e',fix(N/K),T-D,mod(N,K))
ans = '145.237e+04'
Try it with more digits:
>> D = 5;
>> T = 6;
>> K = 10^(2-D+floor(log10(N)));
>> sprintf('%d%.*e',fix(N/K),T-D,mod(N,K))
ans = '14523.7e+02'
5 Comments
Noah Hovde
on 19 Apr 2022
How about expressing the number 0.21e-6 just as it is? I tried using your code and it converts it to 02.10e-07. I really want it to stay as 0.21e-6 so as to preserve units in the calculation that I am performing. Thanks for your help!
Steven Lord
on 19 Apr 2022
If you want the exponent to be a multiple of 3, use one of the ENG options for the format function.
x = 0.21e-6
y = 0.21e-7
format shorteng
disp([x; y])
format longeng
disp([x; y])
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