Axis limits not working

Hi,

I'm trying to get Matlab to plot a Riemann sum using scatterbar3. I want the x axis to go from -2 to 2 but no matter what I try Matlab will not let me scale the xaxis from -2 to 2. I've tried xlim, ylim, axis manual etc but nothing seems to work.This means the graph displays rectangular Riemann bars instead of square ones. The output I get is below:

The code I've done so far is below (I'll add more Riemann bars once I've gotten this issue sorted). If anyone knows how to fix this that would be great!

%% Riemann sums for double integration

clc;
close all;
clear;
m = 20; %Number of increments for riemann sum
a = -2; %Lower limit of integration for square domain
b = 2; %Upper limit of integration for square domain
figure
hold on
xlabel('x')
ylabel('y')

h = (b-a)/m; %increment length
x = a+h/2:h:b-h/2; %mid-point of m increments of x
y = a+h/2:h:b-h/2; %mid-point of m increments of y

mymap = [1 0 0];
colormap(mymap)

axis([-2 2 -2 2]);
axis manual
 for k=1:length(x)
         xforloop = zeros(1,length(x))+x(k);
         zforloop = 9-xforloop.^2 - y.^2;
 end        
    
scatterbar3(xforloop, y, zforloop,h );
hold off

[Mark Conway]

Well that was embarassing - I just had to add the axis command after the scatterbar3 function command - I guess Matlab must just look for the axis commands straight after the plot command.

Answer 1

[Adam Danz]

xlim, ylim, zlim should have worked.

You need to set them after you plot the scatterbar3.

[Mark Conway]

Thanks Adam. Your right - that fixed it.