Matrix dimensions must agree error

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Ryan DiTullio
Ryan DiTullio on 19 Nov 2019
Answered: Walter Roberson on 22 Nov 2019
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);
  1 Comment
Walter Roberson
Walter Roberson on 19 Nov 2019
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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Answers (2)

Urmila Rajpurohith
Urmila Rajpurohith on 22 Nov 2019
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.

Walter Roberson
Walter Roberson on 22 Nov 2019
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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