# Problem with setting specified intervals with colorbar

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Kevin Hanekom on 16 Aug 2021
Commented: Kevin Hanekom on 16 Aug 2021
Good morning,
I am having problems setting specified intervals for my colorbar. I have tried reading the documentation, and looking at previous questions for the function, but nothing seems to work.
Heres the code,
clc; clear;
sig1c = .35031092712186400;
sig1t = .35031092712186400; %.39026571574305700
sig2c = sig1c;
sig2t = sig1t;
% sig3c = .56181805055156500;
% sig3t = .02333758968994630;
sig3c = sig1c; %will reduce to von misses if sig1t = sig1c
sig3t = sig1t;
tau23 = .07; %sheer strenth, tau23 is symetric with tau13
tau13 = tau23;
tau12 = .23;
% Ac = .636384473946997;
% At = .331316020473478;
% Bc = .210346685921127;
% Bt = 0.0628623668872776;
% Cc = Bc;
% Ct = Bt;
Ac = sig1c;
At = sig1c;
Bc = sig1c;
Bt = sig1c;
Cc = sig1c;
Ct = sig1c;
F1 = ((1/sig1t)-(1/sig1c));
F2 = ((1/sig2t)-(1/sig2c));
F3 = ((1/sig3t)-(1/sig3c));
F11 = (1/(sig1c*sig1t));
F22 = (1/(sig2c*sig2t));
F33 = (1/(sig3c*sig3t));
F44 = (1/(tau23^2));
F55 = (1/(tau13^2));
F66 = (1/(tau12^2));
F12 = -0.5*sqrt((F11*F22)); %only defines a range for F12, complete determination for orthotropic materials still needs to be resolved.
F13 = -0.5*sqrt((F11*F33));
F23 = -0.5*sqrt((F22*F33));
%F12 = -7.2806*10^(-4);
%F13 = 7.4203*10^(-4)
%F23 = F13;
% F12 = ((4/(At*Ac))-F11-F22-F66)/2;
%
% F13 = ((4/(Bt*Bc))-F11-F33-F55)/2;
%
% F23 = ((4/(Ct*Cc))-F33-F22-F44)/2;
syms sig1 sig2 sig3 G
[sig1,sig2,sig3] = meshgrid(linspace(-2,2,100));
sig1b = 0;
sig2b = 0;
sig3b = 0;
Data = sqrt(sig1.^2+sig2.^2+sig3.^2);
G = F1.*sig1 + F11.*sig1.^2 + F2.*sig2 + F22.*sig2.^2 + F3.*sig3 + F33.*sig3.^2 + (2*F12.*sig1.*sig2) + (2*F13.*sig1.*sig3) + (2*F23.*sig2.*sig3) - 1;
%G = F1.*sig1 + F11.*sig1.^2 + F2.*sig2 + F22.*sig2.^2 + F3.*sig3 + F33.*sig3.^2 + F44.*tau23.^2 + F55.*tau13.^2 + F66.*tau12.^2 + (2*F12.*sig1.*sig2) + (2*F13.*sig1.*sig3) + (2*F23.*sig2.*sig3) - 1;
G(G>1) = 1;
tiledlayout(1,2)
nexttile
Stich = patch(isosurface(sig1,sig2,sig3,G,0));
isonormals(sig1,sig2,sig3,G,Stich)
isocolors(sig1,sig2,sig3,Data,Stich)
colormap(hot(9))
% Stich.FaceColor = 'interp';
% Stich.EdgeColor = 'black';
xlabel("\sigma_1 (GPa)");
ylabel("\sigma_2 (GPa)");
zlabel("\sigma_3 (GPa)");
title('Tsai-Wu Ultimate Yield Surface');
view(3);
grid on
colorbar('Ticks',linspace(0,10,11),...
'TickLabels',["0" "1" "2" "3" "4" "5" "6" "7" "8" "9" "10"]);
nexttile
H = squeeze(sum(G,3));
contourf(linspace(-2,2,100),linspace(-2,2,100),H);
axis equal
colorbar
xlabel("\sigma_1 (GPa)");
ylabel("\sigma_2 (GPa)");
title('Sum of sig3 data'); Here you can see how the numbers on the colorbar are still floating.
Thanks for the help,
Kevin

Simon Chan on 16 Aug 2021
Edited: Simon Chan on 16 Aug 2021
The limiting factor is the range of your data.
If you really want the colorbar starts from 0 to 10, you need to set the limit as well.
cb=colorbar('Ticks',linspace(0,10,11),...
'TickLabels',["0" "1" "2" "3" "4" "5" "6" "7" "8" "9" "10"]);
cb.Limits=[1 10];
However, as your data are mostly below 4, the color of the colorbar doesn't change for values from 4 to 10 Kevin Hanekom on 16 Aug 2021
Great, thank you for the help!

R2021a

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