
Hello,
 
I have imported data from Excel using the command 
cours=read.delim("w:/apprentissage/cours_2.txt")
after transforming my initial file with tab delimiters
 
It seemed to work
 
It is 2-dimensionnal. When I type cours[5,5],
I get this type of message : "[1] 0,9760942761824 Levels:  0,495628477 0,893728761 0,89640592 0,903398558 ... 3,864414217"
And when I want to multiply it, for example by 2 (cours[5,5]*2), I get : "Warning message:* ceci n'est pas pertinent pour des variables facteurs in: Ops.factor(cours[5, 5], 2)"
i.e. approximately "this is not relevant for factor variables.
 
What can I do if I want to manipulate my variables ?
 
Thank you very much  
 
 
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