forcal 发表于 2011-7-31 10:18

极限测试之Matlab与Forcal普通函数调用效率

数值计算，例如微积分、微分方程求解等存在大量的函数调用，故高效的函数调用对数值计算软件来讲是至关重要的。

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Matlab 2009a的测试代码：f=@(x,y,z,t)x+y+z;
tic;
s=0;
for x=0:1000
  for y=0:100
    for z=0:100
      s=s+f(x,y,z);
    end
  end
end
s
toc

s =
    6.126720600000000e+009

Elapsed time is 9.546717 seconds.发现将函数写成m文件后效率会提高，如下例：
m函数：%file xyz.m
function c=xyz(x,y,z)
c=x+y+z;
end测试代码：tic;
s=0;
for x=0:1000
  for y=0:100
    for z=0:100
      s=s+xyz(x,y,z);
    end
  end
end
s
toc

s =
    6.126720600000000e+009

Elapsed time is 4.724592 seconds.＝＝＝＝＝＝＝＝＝＝

Forcal 9（OpenFC演示）代码：f(x,y,z)=x+y+z;
mvar:
t=sys::clock(),
s=0,
x=0, while{x<=1000,
  y=0, while{y<=100,
    z=0, while{z<=100,
      s=s+f(x,y,z),
      z++
    },
    y++
  },
  x++
},
s;
/1000;结果：
6126720600.
1.109  秒

二者效率有几倍的差距。

ehi28 发表于 2011-12-20 02:04

嗯,不错,支持一下.

alair005 发表于 2012-2-7 13:08

hxftntA 发表于 2019-5-28 17:44

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