How to remove contour line in filled contour plot?

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UTKARSH VERMA
UTKARSH VERMA 2021-8-31
评论： UTKARSH VERMA 2021-9-1
Hi all,
I am plotting a data using contourf but the there is a contour line between the start and end value color even after using the
contourf(x,y,z,'LineStyle','none','linecolor','none')
%or
contourf(x,y,z,'LineStyle','none')
%or
contourf(x,y,z,'linecolor','none')
For example in the attached figure there is a line between dark blue and dark red.
Also, I have tried different colormap but the result is same.

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采纳的回答

DGM
DGM 2021-8-31
编辑：DGM 2021-8-31
Ran in:
Hmm. I didn't think about that. I don't know that it can be done with contourf().
% make a simple linear ramp that cycles
[xx yy] = meshgrid(1:100);
zz = xx;
zz = circshift(zz,[0 -30]);
% this is what happens with contourf()
[~,h] = contourf(xx,yy,zz,9,'linecolor','none');
colormap(jet)
colorbar
% let's try to replicate it with pcolor()
clf; pcolor(xx,yy,zz);
colormap(jet(10)) % set length to number of levels+1
colorbar
shading flat
That's about right. I think it makes the colorbar easier to read anyway.
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DGM
DGM 2021-8-31
编辑：DGM 2021-8-31
Don't use shading interp. When you use shading interp, it will interpolate between the endpoints. It's helpful to understand that what you're looking at with pcolor() is essentially a top-down view of a surf() plot. Note how it interpolates between the maximal values and the minimal values at those boundaries. That transition is steep, but it's not perfectly vertical -- and so all those colors are visible in a narrow line.
Using shading flat doesn't do that:
and so those transition slopes don't show up:

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更多回答（1 个）

KSSV
KSSV 2021-8-31
Try:
pcolor(x,y,z) ;
colorbar ;
shading interp ;
  1 个评论
UTKARSH VERMA
UTKARSH VERMA 2021-8-31
Hi KSSV,
I tried your suggestion but same problem.
So, I have attached my data and here is the code I am using:
contourf(d{1},d{2},d{3}','LineStyle','none')
ylim([0 38]);
xlim([65 98]);
yticks([0:5:38]);
xticks([65:05:98]);
colormap(hsv) %or use jet
colorbar

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