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question sur R
2 messages · Abdelhafid BERRICHI, Spencer Graves
4 days later
My knowledge of French is not adequate to ensure that I understand your question, but since I haven't seen a reply to your post, I will attempt a few comments. Do you know the "X" matrix that generated the "Error in svd(X) : infinite or missing values in x"? If yes, have you tried to find missing or Inf values in X? If X is small, you could print it. Otherwise, you might try "which(is.na(X))" and "which(abs(X)==Inf)". If you don't know the "X" in the error message, I suggest two things: First, have you tried "traceback()"? that may or may not help you. Second, I don't know what function you are using, but much of R is written in R. I have on many occasions listed a function, copied it into a script file and worked through it line by line until I find the problem. If you still have a question, feel free to try this list again. I have two suggestions that may increase the speed and utility of a response: (1) S'il vous plait, ecrire en le langue anglais. Les lectures comme moi ne tienes problems avec des fautes en l'utilization de la langue. Et bien, il y a beaucoup de personnes qui peut repondre a un question posee en anglais q'en francais. (2) PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Bon chance. Spencer Graves
Abdelhafid BERRICHI wrote:
bonjour
je suis el??ve ?? l'ENSAI Rennes et je suis actuellement en stage de fin
d'??tudes
j'ai une question sur R
en fait lorsque le simule 2 lois normales qui sont mes 2 variables
explicatives continus
- une avec que des valeurs > 0 (ou que <0) X1
- l'autre peut prendre aussi bien des valeurs <0 ou >0 X2
et que je regresse le rating (facteur ordonn??) sur X1 ca marche alors que
sur X2 ca ne marche pas : il m'indique l'erreur suivante
Re-fitting to get Hessian
Error in svd(X) : infinite or missing
values in x
pourtant svd(X2) fonctionne bien : il fait bien la d??composition en
valeurs singuli??re
est-ce du au signe des valeurs ou bien est-ce un autre probl??me?
merci d'avance!!
cordialement
abdelhafid berrichi
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