Error: Inner Matrix Dimension Must Agree

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nand patel
nand patel 2020-1-16
评论： David Hill 2020-1-16
clc
clear all
Vd = 0:0.1:0.7
P = ((0.6*Vd)-((Vd*1.5*10^-12)*(exp(38.64*Vd)-1)))
plot(Vd,P)
when i run this code itgives me error : Inner Matrix Dimension Must Agree ?
What changes should i do to get my code correct ?

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采纳的回答

David Hill
David Hill 2020-1-16
Vd = 0:0.1:0.7;
P = ((0.6*Vd)-((Vd*1.5*10^-12).*(exp(38.64*Vd)-1)));%just need a dot (.*)
plot(Vd,P)
  2 个评论
nand patel
nand patel 2020-1-16
can you please explain me why we are using (.*) instead of (*) to overcome this error
Thanks.
David Hill
David Hill 2020-1-16
scarlar * matrix/vector ok to use *, but matrix * matrix (same size) must use .* for element-wise multiplication (* is reserved for matrix multiplication).
element-wise
1./matrix;
Matrix.*matrix;
matrix.^2;
2.^matrix;

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更多回答（1 个）

Stijn Haenen
Stijn Haenen 2020-1-16
you should use " .* " instead of " * " .

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