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...ain 1+z. How can I solve this problem? I tried to set z=integer and then for example matrix[1,1]=i But this does only work if I assign a value for z first. I am very grateful for any help. Thank you very much! David -- View this message in context: http://www.nabble.com/Question-on-Variables-tp22388117p22388117.html Sent from the R help mailing list archive at Nabble.com.