How to differentiate a series of functions denoted by varying a parameter i=1,2 in (h_i)?

I typed the following code and command window displays unrecognised function h_i. If I remove the outer loop and replace "i" with some number, say "2", then it displays unrecognised function x_j. What's the mistake?

clc
clear all
syms x_1 x_2
h_1(x_1,x_2)=x_1+(x_2)*(x_1);
h_2(x_1,x_2)=x_2+x_1*x_2^2;
for i=1:2
    for j=1:2
    diff(h_i,x_j)
    end
end

Answer 1

[darova]

Mistake that h_1 and h_i and different variables

m1stake = 2;
m2stake = 3;
for i = 1:2
    disp(mistake)           % doesn't work
end

Use arrays and cells

clc
clear all
syms x_1 x_2
h_1(x_1,x_2)=x_1+(x_2)*(x_1);
h_2(x_1,x_2)=x_2+x_1*x_2^2;
X = {x_1 x_2};
H = {h_1 h_2};
for i=1:2
    for j=1:2
    diff(H{i},X{j})
    end
end

Answer 2

[Image Analyst]

Don't use a loop. For just 4 cases, just write them out

h_1(x_1,x_2) = x_1 + (x_2) * (x_1);
h_2(x_1,x_2) = x_2 + x_1 * x_2^2;
diff(h_1,x_1)
diff(h_1,x_2)
diff(h_2,x_1)
diff(h_2,x_2)

[Asit Srivastava]

Thanks for the answer. This code is only sample. The actual code involves 56 differentiations.

[Image Analyst]

You don't have 56 separate and differently named variables, do you? If so, you really need to learn how to use arrays.

[Asit Srivastava]

I have 8 functions in 7 variables. Yeah, I am learning MATLAB.