How to use symsum to calcolate residuals

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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
  5 Comments
laura bagnale
laura bagnale on 26 Aug 2021
How Can I accept your cooment/answer?
Thanks a lot

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Accepted Answer

Walter Roberson
Walter Roberson on 26 Aug 2021
Bringing down from above,
R = (z - a*x - b*y - c*x.*y - d).^2;
Rtot = sum(R);

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