# How to display multiple histogram with one run

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Mustafa Vural on 17 Sep 2020
Commented: Mustafa Vural on 19 Sep 2020
I am generating random numbers (data) with the 3 parameter weibull distribution.
In my code, I have 25 combinations of my parameters (b=1:5; T=1:5) and I want to display every single combination as a histogram.
So at the end, I have 25 histogram of data.
The problem is, only the last combination of my parameter ( b=5, T=5) is displayed.
How can I see ALL 25 histograms with one run?
Edit: I deleted the 2 parameter weibull in my code for better overview about my question.
clear all;
n = 100;
t0 = 0.5;
b = 1:5;
T = 1:5;
for v_T = 1:length(T)
for v_b = 1:length(b)
data(:,v_b,v_T) = wblrnd(v_T,v_b, [n,1]) + t0;
end
end
histogram (data)
ax = gca;
get(ax, 'position')
ax.XLim=[0,10];

Hello Mustafa, you can use subplots inside for loops.
clear all;
n = 100;
t0 = 0.5;
b = 1:5;
T = 1:5;
clf
figure(1)
loopVar = 0;
for v_T = 1:length(T)
for v_b = 1:length(b)
data(:,v_b,v_T) = wblrnd(v_T,v_b, [n,1]) + t0;
subplot(length(T),length(b), v_b + loopVar)
histogram (data)
ax = gca;
get(ax, 'position')
ax.XLim=[0,10];
end
loopVar = loopVar + length(T)
end

Mustafa Vural on 17 Sep 2020
Thank you very much, it works. Yes I am noob in matlab... I want to compare the 2 parameter and 3 parameter distribution. So actually it should display 5 figures for data2p and 5 figures for data3p... What do I wrong...?
clear all;
n = 100;
t0 = 0.5;
b = 1:5;
T = 1:5;
for v_T = 1:length(T)
for v_b = 1:length(b)
figure(v_T) % this will count 1:5 and open a new figure each step
data2p(:,v_b,v_T) = wblrnd(v_T,v_b, [n,1]);
data3p(:,v_b,v_T) = wblrnd(v_T,v_b, [n,1]) + t0;
subplot(1,5,v_b)
histogram (data2p)
histogram (data3p)
ax = gca;
get(ax, 'position')
ax.XLim=[0,10];
end
end
Hello Mustafa,
I recommend that you take a look at Mike Cohen's courses: https://www.udemy.com/course/master-matlab-through-guided-problem-solving/
I went through them last year and taught myself MATLAB in that way. I feel that you are trying to solve problems before understanding the basics of what you are doing, which could be fixed in a few hours of practice/watching courses/reading a MATLAB book.
In this case, when you plot data3p, you are overwriting all the information of data2p. You need to plot the information in a different subplot.
clear all;
n = 100;
t0 = 0.5;
b = 1:5;
T = 1:5;
for v_T = 1:length(T)
for v_b = 1:length(b)
figure(v_T) % this will count 1:5 and open a new figure each step
data2p(:,v_b,v_T) = wblrnd(v_T,v_b, [n,1]);
data3p(:,v_b,v_T) = wblrnd(v_T,v_b, [n,1]) + t0;
subplot(2,5,v_b) % subplot is bigger, 2 rows and 5 colums
histogram (data2p)
subplot(2,5,v_b +5) % you need this new subplot here
histogram (data3p)
ax = gca;
get(ax, 'position')
ax.XLim=[0,10];
end
end
Mustafa Vural on 19 Sep 2020
Thank you for the advice, I will five it a try!

Walter Roberson on 17 Sep 2020
You did not put in
hold on

Mustafa Vural on 17 Sep 2020
I dont want to bring them all in one graph, I would like to have 25 single graphs. So i can copy them out and compare them.
Walter Roberson on 17 Sep 2020
Well you can use subplot() or you can use the newer tiled layout operations, if you want all the histograms to appear in the same figure but diffrent axes.
Or you can add a call to figure() to create a new figure each time.