Inner matrix must agree

Question

Alejandro Urbina 2016-2-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/269641-inner-matrix-must-agree

评论： Moe_2015 2016-2-23

So im trying to run the following code...

A1=4; A2=-2; B1=3; B2=1; tau1=100*10^-3; tau2=20*10^-3; w=40*pi; x = linspace(0,2*pi,100); y1 = (A1*exp(-x/tau1))+(A2*exp(-x/tau2)); y2 = (A1*exp(-x/tau1))+(A2*(x/tau1)*exp(-x/tau1)); y3 = (exp(-x/tau1)*(B1*cos(w*x)+B2*sin(w*x))); figure plot(x,y1,'--',x,y2,':',x,y3,'r')

I get the following error:

Error using * Inner matrix dimensions must agree.

Error in Urbina_ps1 (line 10) y2 = (A1*exp(-x/tau1))+(A2*(x/tau1)*exp(-x/tau1));

I dont know how to solve the matrix problem that is happening in the sencond termn of the equation... Im new to matlab and i have been looking for tutorials to trying to solve this...

Ill appreciate any help thank you

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Answer 1

Moe_2015 2016-2-23

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编辑：Moe_2015 2016-2-23

It's because of the x variable. Your x variable is a row vector of a 100 elements. When you use "*" by itself it is doing matrix multiplication. Thus, throughout your code you are trying to multiply a 1X100 vector with another 1X100 vector which is not possible. You should replace all "*" with ".*" as this will allow you to do element wise multiplication.