use x and y in a matrix

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Sa Moha
Sa Moha 2021-12-16
回答： Steven Lord 2021-12-16
I want calculate D(x,y) after running code.
clear;
clc;
syms x y;
E=cell(3,1);
E{1}=[1,1,1;1,2,0;3,5,2];
E{2}=[1,0,0;3,2,1;0,4,3];
E{3}=[0,1,1;0,2,1;2,6,1];
A=[1;5;7];
B=[2,3,4];
C(x)=A+x*B;
D(x,y)=E{y}*C;
D(1,2)
But it returns error. Can someone help please?
Invalid indexing or function definition. Indexing must follow MATLAB indexing. Function arguments must be symbolic
variables, and function body must be sym expression.

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采纳的回答

Steven Lord
Steven Lord 2021-12-16
Ran in:
syms x y;
E=cell(3,1);
E{1}=[1,1,1;1,2,0;3,5,2];
E{2}=[1,0,0;3,2,1;0,4,3];
E{3}=[0,1,1;0,2,1;2,6,1];
A=[1;5;7];
B=[2,3,4];
C=A+x*B;
D = @(xin,y) subs(E{y}*C, x, xin);
D(1,2)
ans = 

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