MATLAB: Create a vector of the even whole numbers between 31 and 75

vector

create vectors of the even whole numbers

A=[32:2:75]

If you are using the symbolic toolbox, use vpa() to evaluate it as decimal.

If the symbolic expression does not contain any symbols, then you can use double() to convert it to a double precision number.

x = 1 : length(psdn);
x128 = linspace(x(1), x(end), 128);
p128 = spline(x, psdn, x128);
plot(x128, p128);