Zero pad using piecewise.

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Vasaf
Vasaf 2024-10-31
回答： Voss 2024-10-31
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);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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采纳的回答

Voss
Voss 2024-10-31
"I need ... that all values of V that are above 0 are set to 0."
V(V > 0) = 0;
or
V = min(V,0);

更多回答（1 个）

Walter Roberson
Walter Roberson 2024-10-31
piecewise() requires that the first input be a symbolic expression.
Your Vr+Va is likely numeric.

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