# Matrix dimensions must agree error

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Ryan DiTullio 2019 年 11 月 19 日

I am trying to graph P as a function of the 4 variables listed, but before I can even get to the graph I keep getting the error message Matrix dimensions must agree:
t=[1:1:5];
V=[1000:1:2500];
D=[2:1:5];
A=[1:1:6];
P=(1+(1./t)).*V.*((D./2)+A);

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Walter Roberson 2019 年 11 月 19 日
No two of your variables are the same size. What size are you expecting the output to be? 5 x 1501 x 4 x 6 ?

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### 回答 (2 件)

Urmila Rajpurohith 2019 年 11 月 22 日
Addition and element wise multiplication is possible only with matrices of same dimensions.
Try to make sure your matrices are of required sizes by padding them with either 0's or 1's if possible.

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Walter Roberson 2019 年 11 月 22 日
t=[1:1:5];
V=[1000:1:2500];
D=[2:1:5];
A=[1:1:6];
[tg, Vg, Dg, Ag] = ndgrid(t, V, D, A);
P = (1+(1./tg)).*Vg.*((Dg./2)+Ag);
The result will be a 4D array, 5 x 1501 x 4 x 6 . You will have a fair bit of difficulty plotting the result, as it requires 5 dimensions to represent (four independent dimensions and one dependent dimension.)

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