Working With Cosine In a Matrix

2 次查看（过去 30 天）

Edwin Macharia 2018-7-15

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/410426-working-with-cosine-in-a-matrix

评论： Edwin Macharia 2018-7-16

I'm trying to work with cosines in a matrix (For the Freudenstein Equation)but but then am getting a pretty consistent error. Here's the line that has a problem:

TermA = [cos(precOutputAngle1Rad),(-cos(precInputAngle1Rad)),1;
         cos(precOutputAngle2Rad),(-cos(precInputAngle2Rad)),1;
         cos(precOutputAngle3Rad),(-cos(precInputAngle3Rad)),1];

The error just reads 'Error in FindTransmissionAngles (line 3)' and the line in bold is the said line. I'm thinking the error is something obvious so Id like someone to point out to me and Id really appreciate that.

NB: dpb edit to format the code line removed bold to introduce code format but did not change anything other than spacing for legibility...

5 个评论
显示 3更早的评论隐藏 3更早的评论

Stephan 2018-7-15

编辑：Stephan 2018-7-15

在 MATLAB Online 中打开

Hi,

is there some more red error text?

To help you it is useful to get the whole error message and the related code. Please format the code after inserting it, by marking it and pressing {}Code - this makes it easier to read.

If you can not insert it, you can attach .m-files and data files needed to execute the code and reproduce your problem.

Until now we only know, that you probably want a matrix A of form

[cos(Out1) -cos(In1) 1;
 cos(Out2) -cos(In2) 1;
 cos(Out3) -cos(In3) 1]

and that for some reason this doesnt work. But we do not know anything about the In / Out values and its data type or what exactly is going wrong.

As you can see here in the following example it should work:

>> A = [cos(39), -cos(12), 1;...
 cos(35), -cos(19), 1;...
 cos(89), -cos(10), 1]
A =
     0.266642932359937  -0.843853958732492   1.000000000000000
    -0.903692205091507  -0.988704618186669   1.000000000000000
     0.510177044941669   0.839071529076452   1.000000000000000

So to help more information is needed.

Best regards

Stepan

Guillaume 2018-7-16

Edwin, as per Stephan's initial request, give us the full text of the error message. Everything in red.

So far, we know that the line produces an error, but the important bit that tells us why it produces an error, you haven't given us.

Edwin Macharia 2018-7-16

I regret my lack professionalism; I came here in a haste. Anyway, I have somehow solved the error. Unfortunately I was not able to identify the problem but the comments helped me narrow down the problem my definition of the variables. For that, am really grateful.

请先登录，再进行评论。

请先登录，再回答此问题。