Differentiating vectors of functions

[alexg]

Just another little thing I noticed, not very important but I think worth mentioning:
As far as I can tell, giac's function_diff() is pretty much the same as Maple's D(), which giac also supports.

Yet, function_diff([sin,cos,tan]) correctly gives

Code : Tout sélectionner

 (` x`)->{ 
  cos(` x`);  
  -(sin(` x`));  
  1+tan(` x`)^2;  
}

While D([sin,cos,tan]) gives

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D(['sin','cos','tan'])

Could that be improved?

[parisse]

You must select maple mode if you want D to be a synonym for function_diff, otherwise it is a valid identifier name (especially useful for geometry).

[alexg]

Thanks very much for that, I was getting a bit confused with the Maple-mode support...
I now see it's working OK, even if the answer is the slightly different

Code : Tout sélectionner

expr("proc(` x`) 
  cos(` x`);  
  -(sin(` x`));  
  1+tan(` x`)^2;  
 
end;")

Gives me enough to go on, anyway

[parisse]

Indeed, display should be optimized. I don't have much time for that now since it's not critical...