MATLAB: Help on sign function argument

dimensionssignsignum

Here's my function:
function xdot=gotp(t,x)
z=0.1; w=1;
A = [0 1; (-22*z*w*sign()-2*z*w) -w];
xdot=A*x;
Called by:
[t,x]=ode45('gotp',[0 10],[0 -0.025]);
I want the sign function to return 1 if x is above 0.010 and 0 if it is below 0.010. How can I do this? I've tried putting different integers into the sign function's parentheses, such as sign(10000) and sign(1), but it has no effect on the output. If I use the variable "x," I get the an error (Dimensions of matrices being concatenated are not consistent.)

Best Answer

Use
2*sign(x-0.01)-1
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