Substituting a value to a syms function in a matrix?

I have a 4x4 matrix

A=

[E11e, 0, 0, 0]

[ 0, E11e, 0, 0]

[ 0, 0, E11e, 0]

[ 0, 0, 0, 0.5*E11e]

where Elle is a symbolic function....(syms E11e)

And I need to substitute the value of Elle as 4.3287e+08.

How should I do it?

Answer 1

[VBBV]

A = subs(A,E11e,4.3287e+08)

Answer 2

[Walter Roberson]

compare:

syms E11e(t)
A1 = [
    E11e,    0,    0,     0
    0, E11e,    0,        0
    0,    0, E11e,        0
    0,    0,    0, str2sym('0.5')*E11e ]

A1(t) = 

syms E11e
A2 = [
    E11e,    0,    0,     0
    0, E11e,    0,        0
    0,    0, E11e,        0
    0,    0,    0, str2sym('0.5')*E11e ]

A2 = 

Notice that the output for the symbolic function case always includes the names of the symbolic function parameters. As you do not show that in your symbol is a symbolic variable rather than a symbolic function.

The replacement method is the same either way:

B1 = subs(A1, E11e, str2sym('4.3287e+08'))

B1(t) = 

B2 = subs(A2, E11e, str2sym('4.3287e+08'))

B2 = 

It would be more common to,

subs(A2, E11e, 4.3287e+08)

ans = 

This has a slightly different meaning than using str2sym() would have: when you use the numeric constant then by default the constant is converted to a rational value (or rational combined with a square root or π); when you use str2sym() like I used there, then a software floating-point number is used.