How to create color map?

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Ilkin Abdullayev
Ilkin Abdullayev 2020-6-5
评论： Adam Danz 2020-6-12
Hello everybody,
I plot a bargraph by using 2x500, and I need to create a colormap. However it is a bit strange colormap so I need code that, for example, all the values between 15-20 will be blue, all the values between 20-25 will be red and so on. I have never worked with bar colormap and especially with this kind of code. If someone can help I would be very glad.
Thanks in advance.
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Ilkin Abdullayev
Ilkin Abdullayev 2020-6-7
Yes, I will have thousands bar graph even more since 7×10000 is only a little part of my full data. Thank you for the link I will try to get a result otherwise I will let you know.
Ilkin Abdullayev
Ilkin Abdullayev 2020-6-8
Hello, I tried stacked bar graph and the resul is good. I have uploaded 2 bar but I will have thousand. So what I need now, is to create a new colormap where I need to specify that for example the number between 15-20 is blue. Then when I plot whereever I will have a value between this range it will trun blue. Not one full column. I mean for example in the picture the second part of both bar from top is red. Then if this red section has a value betwen 15-20 the color will be blue. I have very big data that is why I need a colormap that I can use for all. It is not feasible to change the colors one by one.
Hopefully I explained clearly.

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Adam Danz
Adam Danz 2020-6-8
编辑：Adam Danz 2020-6-10
Use a stacked bar graph by entering an nxm matrix which will produce n bars each with m segments.
h = bar(rand(20,40), 'stacked'); % 20 bars, 40 segments each
Change the color of bars 15-20 to blue.
set(h(15:20), 'FaceColor', 'b')
  2 个评论
Ilkin Abdullayev
Ilkin Abdullayev 2020-6-12
Hello, Sorry for late answer. I found some other way with square scatter but also tried this one and it works.
Just to let to know other that How I got my results:
x=data.a;
y=data.b;
c=deneme13280.Load;
colormap(mymap)
scatter(x, y, [70], c, 's','filled')
xlabel('A');
ylabel('B');
And the reasons to use scatter was that, I need all the pieces of one bar must have same size then I used scatter instead of using my main data in x axis I used it as a color identificator which is c here.
Adam Danz
Adam Danz 2020-6-12
And the result is a bar graph?

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