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senseyeio / roger

Golang RServe client. Use R from Go
MIT License
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assign function #19

Closed lujiacn closed 8 years ago

lujiacn commented 9 years ago

Hi Daniel,

Do you plan implement some basic assignment functions? Which can assign go variable values to R variable. May be start from string array -> string vector or others. If do so, any idea how to programming. May be convert go values to strings with R eval format and evaluate the string?

Regards, Jia

dareid commented 9 years ago

So would this offer a method which you pass say a map of objects in, the library converts to a R eval string which is ran before other evaluations. So something like the following?

value, err := rClient.Eval("x * y", map[string]interface{}{
  "x" : 2,
  "y" : 3,
})
lujiacn commented 9 years ago

Sorry for late reply. One scenario in my project is passing parameters to R and do the calculation. The solution is using struct tag conduct the assignment string. The code may be looks like:

type Info struct {
    Height  string   `r:"height"`
    Weight string   `r:"weight"`
}
Tom := &Info{170, 65}
r.StructAssign(TOM) // will have height, weight defined in R
bmi, err := r.Eval("func_bmi(height, weight)")

May be the function is not so generic for common use.

dareid commented 9 years ago

I think the requirement is generic, in fact I think we could immediately benefit from this functionality at Senseye. However, I am not sure how best to implement it, it could be a lot of work. I will think on it a little more. Great suggestion!