# Plot contours of a heatmap
**URL:** https://discourse.julialang.org/t/plot-contours-of-a-heatmap/37804
**Category:** General Usage
**Tags:** plotting
**Created:** [April 18, 2020, 1:06pm UTC](https://discourse.julialang.org/t/plot-contours-of-a-heatmap/37804 "2020-04-18T13:06:29Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@HenriDeh](https://discourse.julialang.org/u/HenriDeh)
#### Post date: [April 18, 2020, 1:06pm UTC](https://discourse.julialang.org/t/plot-contours-of-a-heatmap/37804/1 "2020-04-18T13:06:29Z")
I have this heatmap of a matrix with Integer values.
But it is best suited for continuous values, so I tried contour instead but the contour links the center of the squares like this:
Is there an easy way to trace the contours that you see in the heatmap ?
---
### Author:  [@AndiMD](https://discourse.julialang.org/u/AndiMD)
#### Post date: [April 18, 2020, 1:36pm UTC](https://discourse.julialang.org/t/plot-contours-of-a-heatmap/37804/2 "2020-04-18T13:36:02Z")
This looks like Plots.jl, so I’ll assume you’re using that.
For me, this makes smooth contours:
```julia
using Plots
A = [(x-5)*(y-5) for x=1:10,y=1:11]
contour(A, w=2, linecolor=:black, fill=true)
```
What version of Plots are you using? Which backend (default GR)? Can you provide a MWE? This makes it easier to help you.
---
### Author:  [@HenriDeh](https://discourse.julialang.org/u/HenriDeh)
#### Post date: [April 18, 2020, 1:44pm UTC](https://discourse.julialang.org/t/plot-contours-of-a-heatmap/37804/3 "2020-04-18T13:44:14Z")
I’m using Plots 0.29.6 yes, with GR.
try this:
```julia
A = reshape([max(i,j) for i in 1:5 for j in 1:5],5,5)
heatmap(A)
contourf(A, levels = 1:5)
```
I would like contour to draw the same squares as the heatmap.
---
### Author:  [@AndiMD](https://discourse.julialang.org/u/AndiMD)
#### Post date: [April 18, 2020, 11:30pm UTC](https://discourse.julialang.org/t/plot-contours-of-a-heatmap/37804/4 "2020-04-18T23:30:24Z")
Sorry for misunderstanding. I don’t know of a straightforward solution, but maybe you can use a hack like this:
```julia
using Plots
A = reshape([max(i,j) for i in 1:5 for j in 1:5],5,5)
function scale4plot(A,f=100)
resize(A,f) = [A[i,j] for i=1 .+(0:f*size(A,1)-1).÷f,j=1 .+(0:f*size(A,2)-1).÷f]
B = resize(A,f)
ax,ay = ( (axes(B,i)./f).+0.5 for i=1:2)
ay,ax,B
end
contour(scale4plot(A)..., w=1, linecolor=:black, fill=true )
```
