Hello I wanted to write code in matlab "without using any toolbox" to do the following things, can we do like this?
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This is the equation calc_value = C0+C1*N+C2*N^2+C3*P1+C4*P2
where C0-C4 = coefficients N, P1, P2 = input values Now suppose the actual value = x
So, error = calc_value - actual value(x)
I squared the error = error^2
Now I want to minimize the sum of error^2 by adjusting the coefficients C0-C4 in the above equations (like we use solver in excel)
Note: Here the actual values and the inputs are available, I don't want to use any toolboxes
this is my table
N N^2 P1 P2 calc actual error error^2
please help if anyone has the idea...
Thanks Vishal
3 个评论
Image Analyst
2013-12-4
How can you have an error (meaning calc-actual) if you don't have the coefficients yet?
回答(1 个)
Image Analyst
2013-12-4
Can't you just use least squares, like
coefficients = calc_value / yourTable;
or something like that? Of course the table would not include calc, actual, error, and must have a column of 1's to start
1, N1, N1^2, P11, P21;
1, N2, N2^2, P12, P22;
1, N3, N3^2, P13, P23;
etc.
Or use the standard least squares solution
Where X is the table I gave above, and y is your calc_values, and beta is your Cn coefficients.
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