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                    فيديو شرح How to draw Heat Map in R language ? ضمن كورس لغة R شرح قناة Unboxing Big Data، الفديو رقم 32 مجانى معتمد اونلاين                
            
            
                One can build in base R, using the heatmap() function with no parameters. 
Note that it takes as input a matrix. 
If you have a data frame, you can convert it to a matrix with as.matrix(), but you need numeric variables only.
each column is a variable. 
Each observation is a row. 
Each square is a value.