plot heatmap not work well

[Liripo]

My data is:

[Elwynn Chen]

This is not tabular data for the heatmap. I understand you want to make a heatmap based on a matrix, but you need to transform the matrix into tabular data first.

example:

from,to,value
mpg,mpg,1
mpg,cyl,-0.852
...

Then you can draw this heatmap where x-axis is from and y-axis is to and color is value.

[Liripo]

Thank you,I see.