String to actual function

Hi,

I have a string array A having 100 entries. The entries are like 1) X1+X2

2) X3+X4

3) X5+X10....etc

where X1, X2,....are variables already existing in the workspace and contain numerical data.

The string array A containing the functions as string, I need to execute it as in, if first entry of string is X1+X2, it pick the entry from the string and actually executes function X1+X2and stores the result in some other variable like H1.

can someone provide the code for it?

[madhan ravi]

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

[Stephen23]

You would be much better off using arrays and function handles.

Answer 1

[Image Analyst]

X1 = randi(9, 1, 5)
X2 = randi(9, 1, 5)
str = 'X1+X2'
H = eval(str)

X1 =

8 2 5 5 6

X2 =

7 7 3 7 6

str =

'X1+X2'

H =

15 9 8 12 12

That said, see the FAQ: FAQ Why is it advised to avoid using the eval function?

Answer 2

[madhan ravi]

AVOID EVAL:

X1 = randi(9, 1, 5)
X2 = randi(9, 1, 5)
str = 'X1+X2'
H = subs(str2sym(str)) % requires symbolic toolbox