Apply a matrix to a function

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Johnny Yoon
Johnny Yoon 2021년 1월 7일
댓글: Johnny Yoon 2021년 1월 25일
Dear Matlab experts,
I would like to apply a matrix into a function as follows.
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; % This is just to make sample equations.
x_vars = (1:1000);
f_ftn (T_syms) = f;
solution = f_ftn(x_vars);
However, I got an error "Symbolic function expected 1000 input arguments but received 1." So, it seems I can't apply a matrix directly to a function. Is there any way that a matrix can be applied to a function? I can use matlabFunction as follows. However, it takes a way too long, like hours. Is there any way which takes a shorter amount of time? Thank you.
f_ftn02 = matlabFunction(f, 'Vars', {T_syms});
solution = f_ftn02(x_vars);
  댓글 수: 2
Walter Roberson
Walter Roberson 2021년 1월 22일
f_ftn02 = matlabFunction(f, 'Vars', {T_syms});
is the way. You could experiment, though, with
f_ftn02 = matlabFunction(f, 'Vars', {T_syms}, 'optimize', false);
As you are not writing to a file, I do not expect it to make any difference, but I saw a recent hint somewhere that some optimization is maybe now being done even when not writing to files, so you could try
Johnny Yoon
Johnny Yoon 2021년 1월 25일
Thank you again for your answer. It worked!

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Deepak Meena
Deepak Meena 2021년 1월 22일
편집: Deepak Meena 2021년 1월 22일
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{:});
  댓글 수: 1
Johnny Yoon
Johnny Yoon 2021년 1월 25일
Thank you very much for your answer. It works!

댓글을 달려면 로그인하십시오.

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