MATLAB: Array indices must be positive integers or logical values.

convolutionerror functionexponentialgaussianMATLAB

keep getting title error message with this code in MATLAB.
a=exp(-1);
o=0.009931621960609;
x2=-2.5:0.1:9.5;
y2=0.5*exp(-a(x2-(0.5*o^2*a)))*(1+erf((x2-o^2*a)/sqrt(2)*o));
o is standard dev of data, a is placeholder value for decay constant.

Best Answer

%true
  a=exp(-1);
o=0.009931621960609;
x2=-2.5:0.1:9.5;
y2=0.5*exp(-a*(x2-(0.5*o^2*a))).*(1+erf((x2-o^2*a)/sqrt(2)*o));
Use element wise matrix multiplication and operation as above
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