# Help with 2D plot from a matrix

조회 수: 2 (최근 30일)
aurc89 2020년 3월 26일
답변: Adam Danz 2020년 3월 30일
I have a matrix (txt file, named "try")) as the one in the picture (left), with different columns (A to C). This data can be plotted using function plot (picture in the middle).
Since the .txt file is a struct, this is the code I use :
a=importdata('try.txt');
dat=a.data; %This does not take into account the first row of letters
...here I normalized the data to 1 (see graph)
plot(dat)
My question is: is there a way to plot this as from a "top" view? Something similar as in the rigth picture, with point of different color intensity according to the y value (between 0 and 1), and with the label of the first row of letter. Is it possible to do something like that? I hope that the principle is clear.
Thanks for the help!
##### 댓글 수: 2없음 표시없음 숨기기
편집: Adam Danz 2020년 3월 26일
In the diagram on the right with circles, what do the row and column indices mean? For example, the 3rd circle in B tells me that there's a peak that's relatively high compared to the other peaks and that it's the 3rd peak, I assume. That's not much information. The transformation from the plot on the left (rich with information) to the plot on the right results in a big loss of information.
If A, B and C vectors all have the same number of rows (or columns) you could put them together in a matrix and use heatmap or imagesc.
aurc89 2020년 3월 30일
imagesc is a good results of what I can represent. Is it possible to show the "labels" of the column in the plotted map (A, B and C in the example)?
Other question: is it possible to change the colors of the colorbar (e.g. from white to red instead of blue to red as default) ?

댓글을 달려면 로그인하십시오.

### 답변 (1개)

Continuing from the comments under the question.
Using imagesc, you can change the tick labels using
set(gca, 'XTick', 1:3, 'XTickLabel', {'A' 'B' 'C'})
and you can change the colormap
colormap('hot')
or any other colormap option.

댓글을 달려면 로그인하십시오.

### 카테고리

Help CenterFile Exchange에서 Colormaps에 대해 자세히 알아보기

### Community Treasure Hunt

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

Start Hunting!

Translated by