How to increase elements of a vector without changing its plot?

Hello forum, I have a vector of x elements (57x1) that I would expand to a y-size vector (3000, for example) but without changing its plot (it is a particular stairs plot). Any idea on how to do it?

Answer 1

[Jan]

What about a "nearest" interpolation?

Y = interp1(1:length(X), X, linspace(1, length(X), 3000), 'nearest')

Then Y contains only values of X, but sampled with a higher frequency. Another simpler approach:

t = round(linspace(1, length(X), 3000));
Y = X(t);

[Shuntao Ji]

great thanks a lot

Answer 2

[KL]

If you have

 X = rand(57,1); %57 elements

if you want to have 3000 elements now,

 X(end+1:end+3000,1) = rand(3000,1);

if you only want to plot the first 57 elements,

 plot(X(1:57,1))

[Alessandro Longo]

But the shape changes. I tried to plot X(1:57,1) and X, there are two different shapes. In particular, I need this plot, that is defined by a vector of 57 elements (so my X is 57x1), but defined by a vector of 3000 elements (so X 3000x1 but the same plot!)

[KL]

I'm not clear with what do you mean. Please show me how you create these vectors.

If you want to create more number of elements between the same limits, use linspace.

 x_57 = linspace(1,30,57);
 x_3000 = linspace(1,30,3000);

if you want to "append" more elements to the first vector ( x_57), then

 x_57_new = [x_57 newVector]