Use index in anonymous function

Question

Abdulaziz 2013-10-3

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/88990-use-index-in-anonymous-function

回答： Walter Roberson 2013-10-3

Hi guys

can i include index in anonymous function for example something like this where T is matrix element. And can i call it in for loop for example:

syms T n m
delta_x=(1/50);delta_t=0.001;
x=0:delta_x:1;
t=0:delta_t:0.25;
Lamda=((delta_t)/((delta_x)^2));
n=1:length(t);m=2:length(x);k=1;
Tem=@(T,n,m)((-Lamda*T(n+1,m-1))+(2*(1+Lamda)*T(n+1,m))-(Lamda*T(n+1,m+1)))....
       -((Lamda*T(n,m-1))   +(2*(1-Lamda)*T(n,m))  +(Lamda*T(n,m+1))); 
for n=1:length(t)-1
    for m=2:length(x)
         if n==1
         T(n,m)=250;
        elseif m==1 && n>=2
                T(n,m)=350;
          else         
      Temp{1}=Tem(T,n,m); % I want to generate several equations from thie line 
           end
      end 
  end

Best Regards,

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Answer 1

Walter Roberson 2013-10-3

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/88990-use-index-in-anonymous-function#answer_98546

在 MATLAB Online 中打开

Yes, it is legal to index a symbol in an anonymous function. It is recommended, however, to initialize the symbol as a matrix.

e.g.,

A = sym('A',dim)

where

dim: Integer or vector of two integers specifying dimensions of A. For example, if dim is a vector [m n], then the syntax A = sym('A',[m n]) creates an m-by-n matrix of symbolic variables. If dim is an integer n, then the syntax A = sym('A',n) creates a square n-by-n matrix of symbolic variables.