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How Can I put some numbers in a sym and sum its cells?

Asked by masoud jiryaei on 4 Sep 2019
Latest activity Edited by madhan ravi
on 4 Sep 2019
I have the matrix [A]= [ a*(x^2)+y , b(y^3)+x ; d*(x^2)*y , c*y ].
and I have the matrix [B]=[1 2;3 4] which the first column of [B] is x and the socond culomn Of [B] is y .
I want to put x=1 and y=2 then x=3 and y=4 and sum A11. then do it for other cells.

  2 Comments

Values of c and d??
a , b,c,d are symbolic variables.

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2 Answers

Answer by madhan ravi
on 4 Sep 2019
Edited by madhan ravi
on 4 Sep 2019
 Accepted Answer

syms a b c d
B = [ 1 2 ; 3 4] ;
x = reshape(B(:,1),1,1,[]);
y = reshape(B(:,2),1,1,[]);
A = [ a*(x.^2)+y , b*(y.^3)+x ; d*(x.^2).*y , c*y ] ;
a = arrayfun(@(z) sum(sum(A(:,:,z))), 1:size(A,3),'un',0);
celldisp(a)

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Answer by KSSV
on 4 Sep 2019

syms a b c d
B = [ 1 2 ; 3 4] ;
x = B(:,1) ;
y = B(:,2) ;
A = [ a*(x(1)^2)+y(1) , b*(y(1)^3)+x(1) ; d*(x(2)^2)*y(2) , c*y(2) ] ;
iwant = sum(A(:))

  1 Comment

excuse me you i mean : A11=(a*(1)^2 + 2)+(a*(3)^2 + 4)
A12=...
A21=...
A22=...

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