I need to plot 3 variables

hi i have 3 variables each in txt file, very large data and contains a lot of missing values, i want to plt 3 files in 3D matrices plot (scatter plot), i tried to load them and then celcted them to be ploted, but it rijected may be because of the large amounts of the missing values inthere??

Any suggestions??

[Fangjun Jiang]

Do you have problem loading the data or plotting the data? What error messages do you have?