MATLAB: How to insert values for a symbolic variable

commalistnumericalseparatedsymbolicSymbolic Math Toolbox

I'm calculating some gradients with symbolic variables and after that I want to insert values for the variables.

So I have a function depandent of multiple variables x(1),…, x(20)

and I want to insert some values for the variables, something like

etc.

such that the function replaces all the x(1) values with 10 and x(20) values with 14

How is that done? Should be simple but I can't find anything helpful explaining how to solve this

Best Answer

 subs(f, {x1, x20}, {10, 14})

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Hi Johnny,

As far as my understanding goes , it is not possible. Because when you create a symbolic function indexed with a list of syms , the MATLAB will consider it as single entity.

But you can do something like this

clear all;
sizee = 1000;
syms 'T' [1 sizee]
T_syms = sym('T', [1 sizee]);
f = sym(zeros(sizee, sizee));
f(:,:) = T1 + T2 + T3 + T4 + ... + T1000; //or use sum(T_syms)
x_vars = (1:1000);
H(T_syms) = f;
cells = num2cell(x_vars);
H(cells{:});

Best Answer

Related Solutions

MATLAB: Alternative to diff(X)

MATLAB: Apply a matrix to a function

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