how can I change the number of digits before decimal point?

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Riyadh Muttaleb
Riyadh Muttaleb 2018-9-10
评论： Steven Lord 2022-4-19
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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Stephen23
Stephen23 2018-9-10
编辑：Stephen23 2018-9-11
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'
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Noah Hovde
Noah Hovde 2022-4-19
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
Steven Lord 2022-4-19
Ran in:
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
x = 2.1000e-07
y = 0.21e-7
y = 2.1000e-08
format shorteng
disp([x; y])
210.0000e-009 21.0000e-009
format longeng
disp([x; y])
210.000000000000e-009 21.0000000000000e-009

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