sym to double data type:

I want to obtain the y_values in double but they are in symbolic form. Anyway I can get around this? Thank you!

L_e = 0.7199;

Y_poly = @(x) a4*x.^4 + a3*x.^3 + a2*x.^2 + a1*x + a0;

x_values = linspace(0, L_e, 100); % 100 points from 0 to L_e

y_values = Y_poly(x_values);

The values for the coefficients are:

a4 = -0.324785

a3 = 0.472768

a2 = -0.011102

a1 = 0.000000

a0 = 1.000000

[Paul]

y_values are alread double based on the posted code.

a4 = -0.324785;
a3 = 0.472768;
a2 = -0.011102;
a1 = 0.000000;
a0 = 1.000000;

L_e = 0.7199;
Y_poly = @(x) a4*x.^4 + a3*x.^3 + a2*x.^2 + a1*x + a0;
x_values = linspace(0, L_e, 100); % 100 points from 0 to L_e
y_values = Y_poly(x_values);

y_values(1:5)

ans = 1x5

1.0000 1.0000 1.0000 1.0000 1.0000

<mw-icon class=""></mw-icon>

<mw-icon class=""></mw-icon>

class(y_values)

ans = 'double'

[Torsten]

There is nothing symbolic in what you posted.

a4 = -0.324785;
a3 = 0.472768;
a2 = -0.011102;
a1 = 0.000000;
a0 = 1.000000;
L_e = 0.7199;
Y_poly = @(x) a4*x.^4 + a3*x.^3 + a2*x.^2 + a1*x + a0;
x_values = linspace(0, L_e, 100); % 100 points from 0 to L_e
y_values = Y_poly(x_values);
plot(x_values,y_values)
grid on

Answer 1

[Walter Roberson]

Your coeffiecients are symbolic. You should use

syms x
Y_poly = matlabFunction(a4*x.^4 + a3*x.^3 + a2*x.^2 + a1*x + a0);