[R] could not find function when compiling PDF

[damiloveu]

it works in console, like this:
> mult.corr(X,Y)
$mult.corr
[1] 0.8382398

$p.mult
[1] 3.570699e-12

$partial.corr
[1]  0.18447499 -0.09837888  0.12007457

$p.partial
[1] 0.2094076 0.5058976 0.4162641

and it doesn't work when compiling.
Error:  chunk 3 (label = ques3) 
Error in eval(expr, envir, enclos) : could not find function "mult.corr"
Execution halted

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