Plugging in values into matlab function

2017 12 2
1 个回答
更新时间：2017 12 2
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0 个投票

Hello, I want to know how to plug in multiple values into an equation that contains multiple variables. I've read using the anonymous function might be useful but I'm not entirely sure. Below is an example of what I mean
P = [eq1;eq2]
x = 1 , y = 3, z = 5
I want matlab to be able to plug in the values of x, y and z into the P matrix (for eq1 and eq2) so that it produces a matrix with number values, so something like P = [2;2]

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Walter Roberson
Walter Roberson 2017-12-2
What is the data type of eq1 and eq2 ?
Jb179
Jb179 2017-12-2
for example eq1 = x^2 +2y +3z and eq2 would be a similiar function
Walter Roberson
Walter Roberson 2017-12-2
So is that
P = {'x^2 +2y +3z'; 'x*y -2z^2'}
or is that
P = ['x^2 +2y +3z'; 'x*y -2z^2 ']
or is it
syms x y z
P = [x^2 +2*y +3*z; x*y -2*z^2]
or is it
syms x y z
P = [x^2 + 2*y + 3*z; x*y - 2*z^2]
or something else?
Jb179
Jb179 2017-12-2
I basically want to do something similar to this:
f= @(x) ... [ 2*x(1)^2+x(1)*x(2)-x(1)-2 ;x(1)^2-x(2) ];
J= @(x) ... [ 4*x(1)+x(2)-1 x(1) ;2*x(1) -1 ];
x=[0.9; 1.1];
however instead of using x(1) I would you x or x(2) would be z

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回答（1 个）

Walter Roberson
Walter Roberson 2017-12-2
编辑：Walter Roberson 2017-12-2

0 个投票

See https://www.mathworks.com/matlabcentral/answers/369859-i-have-an-array-of-anonymous-functions-2x2-array-4-functions-each-with-2-variables-x1-and-x2-an#answer_293659 which is a bit different but gives an idea of how messy it can start to get.
Have you considered possibilities such as
x = @(V) V(1);
y = @(V) V(2);
z = @(V) V(3);
f = @(V) [ 2*x(V)^2+x(V)*y(V)-X(V)-2; x(V)^2-y(V) ];
J = @(V) [ 4*x(V)+y(V))-1*x(V); 2*x(V)-1 ];
?

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