# how to display points from very light red to dark red?

57 views (last 30 days)
davit petraasya on 11 Mar 2016
Commented: davit petraasya on 15 Mar 2016
Hi I have 100 points.(100 x and 100 y). I want to plot the points from very light red to very dark red. 1-point very light red,sequence gets darker and darker, and final 100-point totally dark red. Is it possible to do it?
Thanks!
##### 0 CommentsShow -2 older commentsHide -2 older comments

Sign in to comment.

### Accepted Answer

Julie on 11 Mar 2016
Edited: Julie on 11 Mar 2016
See Below code
c = linspace(1,10,length(x));
G=linspace(.95,0,length(x)); % Increase the .95 for lighter red at beginning, increase the 0 for lighter red at the end
map=[ones(length(x),1),G',G'];
colormap(map)
scatter(x,y,[],c)
##### 2 CommentsShow NoneHide None
Image Analyst on 11 Mar 2016
Or
scatter(x, y, [], c, 'filled'); % Make solid discs instead of hollow discs.
davit petraasya on 15 Mar 2016
Thanks Julie, it helped!

Sign in to comment.

### More Answers (1)

Chad Greene on 11 Mar 2016
I recommend brewermap because Jan Brewer's colormaps have been thoughtfully designed and have a nearly linear lightness gradient. That is, the changes in lightness of Jan Brewer's color maps occur at approximately the same rate as the changes in the data they represent.
Here's an example using scatter. Start with Matlab's default colormap:
scatter(1:100,1:100,50,1:100,'filled','markeredgecolor','k')
Then change the colormap:
colormap(brewermap(256,'reds'))
##### 1 CommentShow -1 older commentsHide -1 older comments
davit petraasya on 15 Mar 2016
Thanks Chad, this way also working perfectly!

Sign in to comment.

### Categories

Find more on Red in Help Center and File Exchange

### Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!