# How can I update the x axis limit inside a loop?

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Muhamed Sewidan on 27 Jan 2020
Commented: Muhamed Sewidan on 27 Jan 2020
% parameters
omav = 5*1000*2*pi; % omega average, center
sigma = [0,0.5,1,2,5].*1000*2*pi; % std deviation. A.K.A width
t = 100;
for i=1:length(sigma)
om = linspace(-3*sigma(i), 3*sigma(i),100);
num = -(om-omav).^2;
den = 2.*sigma(i).^2;
gaus = exp(num./den);
figure(i), plot(om, gaus)
title( [' for sigma = ' num2str(sigma(i)/(2000*pi))] )
set(gca,'xlim',[om(1) om(end)])
end
This is my code, i'm trying to make each figure with new x limits from the value of the variable omm but i get an error says:
" Error using matlab.graphics.axis.Axes/set
While setting the 'XLim' property of 'Axes':
Value must be a 1x2 vector of numeric type in which the second element
is larger than the first and may be Inf "
I thought this because of the zero value of first sigma, therefore i added an if statement that if i>1 , set the x limits, and the error disappeared, but the limits still as they were.

Adam Danz on 27 Jan 2020
On the first iteration, om is all 0s so [om(1) om(end)] returns [0,0] which, as you pointed out, is not allowed when setting axis limits. Here are two ways around that.
Method 1: offset one of the limit values by a very tiny number
set(gca,'xlim',[om(1), om(end)+realmin])
% --or--
set(gca,'xlim',[om(1)-realmin, om(end)])
Method 2: set a default limit when the limits are equal
xl = [om(1), om(end)];
if isequal(xl(1),xl(end))
xl = [0,1];
end
set(gca,'xlim',xl)
##### 2 CommentsShowHide 1 older comment
Muhamed Sewidan on 27 Jan 2020
I wanted it to show the whole plot, as you can see it is cutted. but, I've found that this is the last value

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