For Loop involving n-substitution and creating it as a row vector

Hi,

I have this problem:

Edit : Sorry there is a big typo, if you spot my another typo please tell me.

syms x
n=input('the number of column for row vector= ')
for i=1:n
    b(i)=input(['b',num2str(i),'= '])
end
disp(b); 
y=input('input your function of variable x only= ');
for j=1:n
    A=subs(y,x,j)
end
disp('your new matrix is= ')
disp(A)
%b is a row vector, shortly if input n=3
%my for loop will do 3 input and created it as a row vector
% That is matrix of 1×3 (a row vector)

For example if i input

n=3

b1=1

b2=2

b3=3

y=x^2

Hopefully, it will display something like

your new matrix is =

        1    4    9

I'm squaring for each b.

But when i'm trying this, shamefully this only shows 9 only. 1 and 4 are missing.

very kind of you if you want to help me.

Thanks in advance.

Answer 1

[JESUS DAVID ARIZA ROYETH]

n=input('the number of column for row vector= ');
for i=1:n
    b(i)=input(['b',num2str(i),'= ']);
end
disp(b); 
y=input('input your function of variable x only= ','s');
y=str2func(vectorize(['@(x) ',y]));
A=y(b);
disp('your new matrix is= ')
disp(A)

[Fahmy Shandy]

If i input y=x^2 (with or without little dot)

It appears

??? Undefined command/function '@(x) x.^2'.

Error in ==> my file at xx

A=y(b);

[Fahmy Shandy]

Thanks, for your hints and answer. I found where is my mistake.