MatLab/Octave函数体中是否有分号? [英] semicolons or not in Matlab / Octave function bodies?
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问题描述
考虑Octave/MatLab中的以下两个函数;它们之间唯一的区别是Body中的行是否以分号结尾:
function [a, b, c] = fooNoSemicolons (x, y, z)
a = x * 42
b = y + 42
c = (x * y) / (z * 42)
endfunction
function [a, b, c] = fooSemicolons (x, y, z)
a = x * 42;
b = y + 42;
c = (x * y) / (z * 42);
endfunction
现在考虑以下调用及其输出:
fprintf ("no semicolons:
"); disp (fooNoSemicolons (12, 13, 14));
fprintf ("done
");
fprintf ("semicolons:
"); disp (fooSemicolons (12, 13, 14));
fprintf ("done
");
显然,这两个函数生成相同的结果,即a的值,即504,但我不太清楚其中是否存在语义上的不同。no semicolons: a = 504 b = 55 c = 0.26531 504 done semicolons: 504 done
我还找不到关于MatLab/Octave中分号含义的文档,但我又做了几个实验,但没有提供太多信息:
fprintf ("noSemicolons:
");
[someA, someB, someC] = fooNoSemicolons (12, 13, 14);
fprintf ("done
");
disp ([someA, someB, someC]);
fprintf ("semicolons:
");
[moreA, moreB, moreC] = fooSemicolons (12, 13, 14);
fprintf ("done
");
disp ([moreA, moreB, moreC]);
fprintf ("noSemicolons:
");
otherStuff = fooNoSemicolons (12, 13, 14);
% otherStuff apparently does not get bound to an array or vector!
disp (otherStuff);
fprintf ("done
");
fprintf ("semicolons:
");
moreStuff = fooSemicolons (12, 13, 14);
% moreStuff apparently does not get bound to an array or vector!
fprintf ("done
");
disp (moreStuff);
noSemicolons: a = 504 b = 55 c = 0.26531 done 504.00000 55.00000 0.26531 semicolons: done 504.00000 55.00000 0.26531 noSemicolons: a = 504 b = 55 c = 0.26531 504 done semicolons: done 504
推荐答案
在MatLab/Octave代码行尾放置分号可防止控制台打印答案/变量赋值/其他内容。
x=5
将x设置为5并打印x的值。
x=5;
将x设置为5。
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