Pinv with martix different answer from command windows and script

3 次查看（过去 30 天）

显示更早的评论

bondpen 2018-4-13

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/394691-pinv-with-martix-different-answer-from-command-windows-and-script

评论： bondpen 2018-4-13

在 MATLAB Online 中打开

So, so the commands works seperating in command windows but when i put into a script it seem to give me a different answer.

function x = script_21(A,b)
   x=pinv(A)*b;
end

5 个评论
显示 3更早的评论隐藏 3更早的评论

John D'Errico 2018-4-13

As I expected. What often happens is you got sloppy. You called it with two different inputs, without realizing you did that. But you thought they were the same input.

One thing I learned a LONG time ago is to test everything I do. I know exactly what I have in every computation. Plot it. Look at the results. Verify everything, at every step. This teaches you to be careful. How did I learn that?

Because once, early in my career, I did some work for a client, getting an incredibly pretty result. I plotted it out. It was very nice looking. Then later, I tried to recreate what I did, doing what I thought I recalled having done before. I never did manage to get that pretty result, even from the original data. So what I must have done is screw it up. In some way, I created a result that looked like what I was expecting, what I wanted to see. It was just a mirage though.

bondpen 2018-4-13