Array indices must be positive integers or logical values.

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.

Answer 1

[VBBV]

%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

Answer 2

[Théophane Dimier]

you may have forgot a multipkliication sign:

y2=0.5*exp(-a*(x2-(0.5*o^2*a)))*(1+erf((x2-o^2*a)/sqrt(2)*o));

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here

Matlab was then understanding that you wanted to access a element of a as if it was an array.