Zero pad using piecewise.

Hello,

I need help zero padding a function.

This the code for the function:

Vr = (eps*((r0./r).^12)); 
Va = (-eps*(2*(r0./r).^6));
V = Vr+Va

I need to zero pad it so that all values of V that are above 0 are set to 0.

So in written forms I need this:

{0, V>0}

V=

{V, V<0}

I tried this so far:

V = piecewise(Vr+Va>0,0, Vr+Va<0,Vr+Va);

but I keep getting this error:

Incorrect number or types of inputs or outputs for function piecewise.

Error in Project_2 (line 22)

V = piecewise(Vr+Va>0,0, Vr+Va<0,Vr+Va);

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Answer 1

[Voss]

"I need ... that all values of V that are above 0 are set to 0."

V(V > 0) = 0;

or

V = min(V,0);

Answer 2

[Walter Roberson]

piecewise() requires that the first input be a symbolic expression.

Your Vr+Va is likely numeric.