How to use symsum to calcolate residuals

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laura bagnale 2021-8-25

回答： Walter Roberson 2021-8-26

Hello everyone!

Could someone help me, please?

I have these vectors:

x = [0; 0; 0; 0; 1]           
y = [1; 0.15; 0.03; 0; 0.89]             
z=[0; 0.35; 0.70; 1; 0.86]

I would like to calculate this redisuals' expression:

Rtot = sumRi , Ri = (zi - a*xi - b*yi - c*xi*yi - d).^2

for each index i. For example for i = 4 I would have:

Ri = (0.86 - a*1 - b*0.89 - c*1*0.89 - d).^2.

Is there a way to perform this sum?

Thank you very much in advance for your suggestions and help.

Regards

Laura

laura bagnale 2021-8-26

Thank you very much to both of you for your help.

I tried and it works!

Regards

Laura

laura bagnale 2021-8-26

How Can I accept your cooment/answer?

Thanks a lot

Walter Roberson 2021-8-26

Bringing down from above,

R = (z - a*x - b*y - c*x.*y - d).^2;
Rtot = sum(R);

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