colour for cells with NA value on gheatmap

[Yue]

Hi,

I'm making gheatmap with continuous values except some of the values are NA.

When I set the two colours for low and high, the cells with NA are white as I wish.

But when I use a colour scale as below since I want more colours on heatmap, the NA cells are coloured as grey. 

If I colour all the cells as white with scale_fill_gradientn(colours = "white"), those NA cells are still grey.

I've tried to change the panel and plot background but it doesn't change.

So, how can I leave NA cells as white if I want to use a colour scale?

[Yu, Guangchuang]

as usual, reproducible example pls.

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1. G Yu*, TTY Lam, H Zhu, Y Guan*. Two methods for mapping and visualizing associated data on phylogeny using ggtree. Molecular Biology and Evolution, 2018, 35(2):3041-3043. doi: 10.1093/molbev/msy194
2. G Yu, DK Smith, H Zhu, Y Guan, TTY Lam*. ggtree: an R package for visualization and annotation of phylogenetic trees with their covariates and other associated data, Methods in Ecology and Evolution, 2017, 8(1):28-36. doi:10.1111/2041-210X.12628
3. Book: https://yulab-smu.github.io/treedata-book/
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Guangchuang Yu PhD

Professor
School of Basic Medical Sciences

Southern Medical University

Guangzhou, China

www: https://guangchuangyu.github.io

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