MATLAB Answers

How would one update the plotted data without resting the figure axes labels and other format elements?

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Josh Ezekiel on 12 Oct 2019
Answered: darova on 16 Oct 2019
while t<=tf
for i=2:Nx
for j=2:Ny
T(i,j) =T(i,j)+dt*alpha*(((T(i-1,j)-2*T(i,j)+T(i+1,j))/dx^2)+((T(i,j-1)-2*T(i,j)+T(i,j+1))/dy^2));
history_T=cat(3,history_T,T);
end
end
t=t+dt;
X=[0:0.05:1];
Y=[0:0.05:1];
%% PLOT
surf(X,Y,T)
pause(0.01)
%% FORMATING ELEMENTS
xlabel('Width, \$m\$','Interpreter','Latex')
ylabel('Depth, \$m\$','Interpreter','Latex')
zlabel('Temperature, \$T\$','Interpreter','Latex')
xlim([0 Lx])
ylim([0 Ly])
zlim([0 100])
set (gca,'FontSize',10,'FontName','Times')
set(gcf,'color','w');
end
Where X and Y are row vectors and T is a matrix with dimensions (length(X),length(Y). T updated with every repitition of the while loop, producing a surf plot that changes accordingly.
The plot appears with default formatting until the final iteration where it formats it as I intend.
How can I instruct MATLAB to keep the formatting elements constant throught the iteration?
Many thanks.

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Answers (2)

Divya Yerraguntla on 16 Oct 2019
Hi Josh,
Try placing the pause(0.01) line of code after %% Formating elements section i.e. after the set(gcf,'color,'w') and not after the surf(X,Y,T). This actually helps in pausing and viewing the surf plot after all the required formatting is done.
Hope it works!

1 Comment

Josh Ezekiel on 16 Oct 2019
Hi Divya,
Thank you for the response. I have implemented your suggestion into my code, however the result seems to be more of a 'work around' rather than a fix. The formatting elements of the figure (axis titles, font, font size, etc...) do indeed visibly change, however the latency associated with the generation of each figure--not the 0.01s pause--causes these elements to jitter rapidly. I was wondering whether there was a way of setting the default formatting elements so the only element of the figure that appears to change is the surf(X,Y,T) itself.
Many thanks.

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darova on 16 Oct 2019
Use hold on command
%% FORMATING ELEMENTS
figure(1)
xlabel('Width, \$m\$','Interpreter','Latex')
ylabel('Depth, \$m\$','Interpreter','Latex')
zlabel('Temperature, \$T\$','Interpreter','Latex')
xlim([0 Lx])
ylim([0 Ly])
zlim([0 100])
set (gca,'FontSize',10,'FontName','Times')
set(gcf,'color','w');
hold on
while
h = surf(X,Y,T);
pause(0.01)
delete(h);
end
hold off

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