Data visualisaton

Plotting heatmaps from big matrices in R

In genomics, and in many other -omics or big data fields, we often try to plot big matrices. By big matrices, I mean matrices that have more columns and/or rows than pixels in your device. For example, if we have a 50 column-matrix with one line per gene (~20,000 lines), then there are likely more lines in this matrix than pixels in your screen - 1080 vertical pixels in an HD screen (unless you’re reading this in a fancy future of hyper high definition).