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How to change contour level in different range?

Asked by Kim Je Young on 15 Jul 2019
Latest activity Commented on by Kim Je Young on 16 Jul 2019
Accepted Answer by KSSV
Hello, I am new to Matlab.
Currently, I am plotting BSFC map using contour function.
I wanna set different levelstep instead of fixed value.
Due to fixed LevelStep, the below graph looks so ugly.
For levelList<300, I would like to set levelStep=50, and for LevelList>300, I would like to set LevelStep as 5.
Is there any way to control Level Step (Isoline) in different LevelList?
FYI, here is my code.
Thank you for your help in advance.
rawdata=xlsread('BSFC_NA2.xlsx','Sheet1','A1:I88');
RPM =rawdata(:,1);
Torque = rawdata(:,2);
bsfc = rawdata(:,3);
R100 = rawdata(:,4);
T100 = rawdata(:,5);
RPM1 =rawdata(:,6);
Torque1 = rawdata(:,7);
bsfc1 = rawdata(:,8);
% Create gridded data:
Rpmgrid = linspace(1000,max(RPM),10);
Torquegrid = linspace(0,90,10);
BSFCgrid = gridfit(RPM,Torque,bsfc,Rpmgrid,Torquegrid);
[c1,h1]=contour(Rpmgrid,Torquegrid,BSFCgrid,'LevelStep',5,'ShowText','on'); drawnow
set(h1.EdgePrims(h1.LevelList>0 ), 'LineStyle', 'dotted');
hold on
k5=plot(R100,T100,'r','LineWidth',3)
hold on
untitled.jpg

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1 Answer

Answer by KSSV
on 15 Jul 2019
 Accepted Answer

[X,Y,Z] = peaks(100) ;
figure
hold on
contour(X,Y,Z,'LevelList',-6:0.2:4) % levels with difference 0.2 for till 4
contour(X,Y,Z,'LevelList',4:0.5:8) % levels with difference 0.5 from 4 to 8

  1 Comment

Thanks alot! It works perfetcly as I wish!

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