Question

I would like to plot with X and Y, when I update the range of X, the vector size would change, so Y need to be assigned again like this:

>> y = sin(x)

If I don’t do that, I normally got:

>> plot (x,y)
Error using plot
Vectors must be the same lengths.

So I wonder, If there’s a way of making that automatically done

Answer 1

You could make y a function (handle),

y = @(x)sin(x)
plot (x,y(x),x2,y(x2),x3,y(x3),x4,y(x4))

Of course with such a simple function you could just stick with sin too, i.e.

plot (x,sin(x),x2,sin(x2),x3,sin(x3),x4,sin(x4))

You could combine the plot command too to simplify the call further:

plotsin = @(x)plot(sin(x));

such that you can call

plotsin(x);

for any input x