Axis limits not working

Question

Mark Conway 2021-4-21

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https://ww2.mathworks.cn/matlabcentral/answers/808320-axis-limits-not-working

评论： Mark Conway 2021-4-21

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

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Mark Conway 2021-4-21

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.

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