# Heatmap wrong colorbar number resolution limits
**URL:** https://discourse.julialang.org/t/heatmap-wrong-colorbar-number-resolution-limits/110209
**Category:** Visualization
**Tags:** question, plots
**Created:** [February 14, 2024, 2:47pm UTC](https://discourse.julialang.org/t/heatmap-wrong-colorbar-number-resolution-limits/110209 "2024-02-14T14:47:07Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@jcbritobr](https://discourse.julialang.org/u/jcbritobr)
#### Post date: [February 14, 2024, 2:47pm UTC](https://discourse.julialang.org/t/heatmap-wrong-colorbar-number-resolution-limits/110209/1 "2024-02-14T14:47:07Z")
Hello, good morning
I’m having some diffucults plotting a covariance matrix with low values. The colorbar always shows zero, and cant acquire the correct values. There are configurations thats solves this issue?
```julia
let
# now for pca
X = Matrix(df[!, 2:10])
@info size(X)
X = X .- mean(X, dims=1)
@info size(X)
# these data are observations by features, so we need X'X, not XX'
covmat = X'*X / (size(X)[1] -1)
@info covmat
# visualize it
heatmap(covmat, yflip=true, clims=(-.0002, .0002))
end
```
---
### Author:  [@juliohm](https://discourse.julialang.org/u/juliohm)
#### Post date: [February 14, 2024, 3:01pm UTC](https://discourse.julialang.org/t/heatmap-wrong-colorbar-number-resolution-limits/110209/2 "2024-02-14T15:01:17Z")
It is always good practice to share the plotting library being used. Also, do you expect a solution with this plotting library specifically, or a solution with an alternative library is desirable?
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### Author:  [@jcbritobr](https://discourse.julialang.org/u/jcbritobr)
#### Post date: [February 14, 2024, 3:03pm UTC](https://discourse.julialang.org/t/heatmap-wrong-colorbar-number-resolution-limits/110209/3 "2024-02-14T15:03:30Z")
Its the Plots.jl. Solution maybe in any library, but will be better if it was implemented in Plots.jl
---
### Author:  [@rafael.guerra](https://discourse.julialang.org/u/rafael.guerra)
#### Post date: [February 14, 2024, 3:25pm UTC](https://discourse.julialang.org/t/heatmap-wrong-colorbar-number-resolution-limits/110209/4 "2024-02-14T15:25:22Z")
The problem seems to be that the colorbar got truncated by a narrow figure margin. Increase it with `Measures`:
```julia
using Measures(), Plots; gr()
M = (rand(9,9) .- 0.5)/2000
heatmap(M, clims=(-0.0002, 0.0002), margins=10mm)
```
---
### Author:  [@jcbritobr](https://discourse.julialang.org/u/jcbritobr)
#### Post date: [February 14, 2024, 3:33pm UTC](https://discourse.julialang.org/t/heatmap-wrong-colorbar-number-resolution-limits/110209/5 "2024-02-14T15:33:14Z")
@rafael.guerra thank you. It worked
