I didn’t realise MATLAB no longer printed out three-digit exponents by default. This may seem a long way round, but ‘expstr’ works for both +ve and -ve exponents:
Q1 = pi/10000;
expstr = @(x) [x*10.^floor(1-log10(abs(x))) floor(log10(abs(x)))];
Result = sprintf('%.4fe%+04d', expstr(Q1))
Result =
3.1416e-004
EDIT — Added abs(x) to log10 arguments in the ‘expstr’ function.
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EDIT — (4 May 2021 at 16:38)
Correcting my ‘expstr’ function to not crash on a 0 argument turned out to be surprisingly straightforward —
expstr = @(x) [x(:).*10.^ceil(-log10(abs(x(:)+(x==0)))) floor(log10(abs(x(:)+(x==0))))]; % Updated: 2021 05 04
Given:
Q1 = [-pi*1000; 0; pi/1000];
Result = sprintf('%8.4fe%+04d\n', expstr(Q1).')
.
