Change the value of independent variables to solve the dependent variable equation

x=0:0.5:4*pi;
y=sin(x)+cos(x);
display(y);

In the above example the y(x) is given . Now i want to use y(Ax) in other equations (where A is some constant or variable) without hampering the original x values.

Please tell me how to do it.

Answer 1

[darova]

Use function handle

x = 0:.1:10;
f = @(a) sin(a*x);
plot(x,f(2),'r')
line(x,f(5))

[Deepro Bardhan]

Yes that worked .Thanks sir

Answer 2

[KSSV]

x=0:0.5:4*pi;
y=sin(x)+cos(x);
xi = x(2)*rand ; 
yi = interp1(x,y,xi) ;
plot(x,y,'r',xi,yi,'*b')

[Deepro Bardhan]

Sir I wanted y(Ax) which means it will evaluate

sin(Ax)+cos(Ax) 

I didnt ask for the interpolation of a certain value of x.