Error in line 2... Won't plot my graph.
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T= 1:5:1000;
P=(10*(log(T/298))*T)+(12.41*T)+1550;
plot(T,P)
What's wrong with my code, why won't it run?
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Walter Roberson
2015-9-19
P = (10*(log(T/298)).*T) + (12.41*T) + 1550;
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3 个评论
Morgan Sadler
2015-9-19
Morgan Sadler
2015-9-19
Walter Roberson
2015-9-19
T is a row vector 1 x 200, so log(T/298) is a row vector 1 x 200, so 10*(log(T/298)) is a row vector 1 x 200. You then had that "*" T. That is one row vector 1 x 200 "*" a row vector 1 x 200. But "*" is algebraic matrix multiplication. For matrix multiplication, the "inner dimensions" must be the same -- the second dimension of the left matrix must be the same as the first dimension of the right matrix. 1 x 200 by 1 x 200 does not satisfy that condition -- 200 ~= 1. So you get an error.
You could transpose the first matrix to be 200 x 1 using the .' operator, so that you were working with 200 x 1 by 1 x 200, if you wanted to get out a 200 x 200 matrix. Or you could transpose the second matrix to be 200 x 1, so that you were working with 1 x 200 by 200 x 1, if you wanted to get out a 1 x 1 matrix. Or you can switch to the element-by-element multiplication operator, .* instead of the matrix multiplication operator * and that is what I changed your code to.
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