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                    Video of How to draw Heat Map in R language ? in R Programming Language course by Unboxing Big Data channel, video No. 32 free certified online                
            
            
                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.