[Solved] How to put values to R Matrix cells?

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Do this instead (add your labels to the data object, and then use geom_tile and then geom_text)

gg <- ggplot(data = cbind(melted_cormat,ids, ages), 
             aes(x=Var1, y=Var2, fill=value)) +
        scale_x_discrete(labels = ids ) +
        scale_y_discrete(labels = ids)
 gg + geom_raster( aes(fill=value)) +
      geom_text(  aes(x=Var1, y=Var2, label = ages), color="red", size=3)

This brings the needed data into the naming environment where the gg-functions will be able to see those named columns. The geom_raster function builds an grid of cells to which attributes (“aesthetics”) such as color or text can be added. By default it mimics the base-graphics function image upon which all of the heatmap-type functions derive by coloring with a color scale constructed using the range of the “fill”-aesthetic.

Output

enter image description here

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solved How to put values to R Matrix cells?