DeaR useRs:
Excuses by my English.
I have a problem with 'expression' function.
For example:
a<-expression(exp(-x^2))
b<-expression(exp(x^2))
And I want to calculate:
a*b
And R returns:
Error in a * b : non-numeric argument to binary operator
I don't know what happend.
Which is the way to making operations with expressions?
Thanks.
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