matlab循环一亿次好象很慢啊

Question

我用matlab编写了一段程序,要求循环一亿次,每次循环中用两个随机数.
但是循环时间好长啊,一个多小时还没有结束.请问是怎么回事啊??

matlab运行时间真的很慢吗??
这个程序每次循环有有20行,每次循环中用两个随机数,
我如果用vb编写,循环一亿次要多长时间呢??

Answer 1

matlab是解释性语言，装载一次，执行一次，当然慢了。不像c语言，一次性装在，一次执行。
建议更改代码，比如说用矩阵运算等
vb也是解释性语言。。。

Answer 2

跟你的CPU运算频率有关啊,3.0GHZ算都很慢的

matlab循环一亿次当然很慢了

我都经常运算一天一夜的

Answer 3

1. you may want to use function tic()/toc() to see how much time your program is needed for one step. Then you can estimate how long will the loop take. To obtain accurate result, you may use the time of 100 steps as benchmark. If the amount of time is acceptable, you just let it run.

2. you should try to optimize your code when you want it to run fast. The way in matlab is basically called vectorization. If the calculation in any step does *not* solely depend on the results of previous steps, the amount of run time could be dramatically reduced after vectorization.

3. other tips for speeding up your code include: allocate memory for storing results in each step before the loop begins; prevent outputting texts/figures in the middle of the loop; etc.

Answer 4

你有没有在每句后面加分号
；