?? siunits.m
字號:
function [factor,prefix] = SIunits(x)% [factor,prefix] = SIunits(x) % The factors and suffixes supported are:% 1e-3 m milli 1e3 k kilo% 1e-6 u micro 1e6 M mega% 1e-9 n nano 1e9 G giga% 1e-12 p pico 1e12 T tera% 1e-15 f femto 1e15 P peta% 1e-18 a atto 1e18 E exa % 1e-21 z zepto 1e21 Z zeta% 1e-24 y yocto 1e24 Y yottaprefixes_n = {'m';'u';'n';'p';'f';'a';'z';'y'};prefixes_p = {'k';'M';'G';'T';'P';'E';'Z';'Y'};if x~=0 p = floor( log10( abs(x) ) / 3 );else p = 0;endif p>0 p = min(p,length(prefixes_p)); prefix = prefixes_p{p}; factor = 10^(3*p);elseif p<0 p = min(-p,length(prefixes_n)); prefix = prefixes_n{p}; factor = 10^(-3*p);else prefix = ''; factor = 1;end
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