How to modify the y-axis tick label and tick values (2016a)

조회 수: 9 (최근 30일)
AA
AA 2021년 6월 23일
댓글: AA 2021년 6월 24일
I have three variables day, time and z2 and i plot using imagesc. Below are the data information:
data information:
day 1*1420 double(each number is equal to 6 hours)
time 1*3001 double (this case has -300:300 with interval of 0.2)
z2 1420*3001 double
Later I converted the weeks segments into date by using below code.
fig=figure(ii);
h1=subplot(3,1,1);
imagesc(time,day,z2);
colormap(jet)
YTickStr = char(datetime('10/10/2018', 'InputFormat', 'dd/MM/yy', 'Format', 'dd/MM/yy') + hours(day*6));
set(gca, 'YTick', 1:lengday, 'YTickLabel', YTickStr);
xlim([-100 100]);
If i do not use any interval, ticks label are so difficult to read as below and I cant read any thing
Later, I change the interval with 1:500:lengday and it starts from 1JAN which i exected to start from 10/10/18.
How can I modify the code so that it gives me the interval based on Ytrickstr?
here is my failed attemt which gives me the first 5 values from YTickStr.
yval = ylim(gca);
set(gca,'YTick',linspace(yval(1),yval(2),5),'YTickLabel', YTickStr)
YTickStr files is like this
10/10/18
10/10/18
10/10/18
11/10/18
11/10/18
11/10/18
11/10/18
12/10/18
12/10/18
12/10/18
12/10/18
13/10/18
13/10/18
13/10/18
13/10/18
14/10/18
Thank you very much

채택된 답변

Rik
Rik 2021년 6월 23일
편집: Rik 2021년 6월 23일
The trick is to select part of your YTickStr:
L=round(linspace(1,size(YTickStr,1),5));
% use round to round to integer indices
yval=ylim;yval=linspace(yval(1),yval(2),numel(L));
%this is only approximate
set(gca,'YTick',yval,'YTickLabel', YTickStr(L,:))
%exact yval:
yval=yval(1) + diff(yval)* (L-1)./(numel(L)-1);
  댓글 수: 6
Rik
Rik 2021년 6월 23일
No problem, this forum can be less intuitive for newer members.
yval is derived from ylim, which returns only two values, but the second part of the line expands this to the same count as L, which was set to 5 in the line before it.
So yval and L should have the exact same number of elements.
AA
AA 2021년 6월 24일
For sure, I checked above script and it does not work that's why shared the modified code. We do not need to use Ylim. BTW, thanks again.

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추가 답변 (1개)

AA
AA 2021년 6월 23일
imagesc(time,day,z2);
colormap(jet)
YTickStr = char(datetime('10/10/2018', 'InputFormat', 'dd/MM/yy', 'Format', 'dd/MM/yy') + hours(day*6));
yval = ylim(gca);
L=round(linspace(1,size(YTickStr,1),5));
set(gca,'YTick',day(:,L),'YTickLabel', YTickStr(L,:))

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