Why does histogram gives issues? I rephrased my question

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Sadiq Akbar 2022-11-16

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评论： Sadiq Akbar 2022-11-20

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I have the following set of data:

fitness1=rand(100,1)*1e-7;

fitness2=rand(100,1)*1e-5;

fitness3=rand(100,1)*1e-3;

Each set of fitness1, fitness2 and fitness3 has 100 independent elements. I want to plot its histogram such that the x-axis is logrithmic having values like 10^-2, 10^-3, 10^-4....and the y-axis shows us how many elements have that corresponding fitness values in each fitness? Say for example we have 10^-3 on axis, so how many values in each fitness1, fitness2 and fitness3 are there having values in the range of 10^-3. Likewise, if we have 10^-5 on x-axis, then how many values in side each fitness are there having this range of 10^-5 and so on. I tried the following but its not like the one in the attachment.

clear all
clc
load 2sn35
one=sort(one,'descend');
fitness2sn35=one;
load 2sn45
one=sort(one,'descend');
fitness2sn45=one;
[~,edges1] = histcounts(log10(fitness2sn35));%[~,edges] = histcounts(log10(x));
[~,edges2] = histcounts(log10(fitness2sn45));
histogram([log10(fitness2sn35) log10(fitness2sn45)] )% histogram(log10(fitness2sn35))
xticklabels(num2cell(10.^get(gca,'XTick')));

I want a grpah like this, but I don't get like this?

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回答（2 个）

Steven Lord 2022-11-16

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x = rand(1, 1e5)*1e-5;
ax = axes;

Specify bins edges with logarithmic spacing.

h = histogram(ax, x, 10.^(-10:-5));

Set the XScale property of the axes to 'log'. You need to do this after the call to histogram not before.

ax.XScale = 'log';

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Sadiq Akbar 2022-11-17

Ok dear Walter Roberson.

Sadiq Akbar 2022-11-17

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@Walter Roberson

I wrote the code according to Steven as follows:

clear all
clc
load 2sn35 %x = rand(1, 1e5)*1e-5;
x1=sort(one,'descend');
fitness2sn35=x1;
load 2sn45 %x = rand(1, 1e5)*1e-5;
x2=sort(one,'descend');
fitness2sn35=x2;
ax = axes;
%Specify bins edges with logarithmic spacing.
h = histogram(ax, x1, 10.^(-10:-5));
h = histogram(ax, x2, 10.^(-10:-5));
%Set the XScale property of the axes to 'log'. You need to do this after the call to histogram not before.
ax.XScale = 'log';

But it gives me an empty figure widow.

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Image Analyst 2022-11-17

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See my collection of demos attached that put insets within larger axes.

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Sadiq Akbar 2022-11-17

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@Image Analyst

I tried your code on my data as follows:

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables. Or clearvars if you want.
fontSize = 18;
load 2sn35
one=sort(one,'descend');
x1=one; % x1 = linspace(0, 1);
load 2sn45
one=sort(one,'descend');
x2=one;%x2 = linspace(3/4, 1);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% I don't have y1 and y2. But my data on y-axis should be the strength in
% each data between 1 and 100 of the fitness values that how many those
% values are there in each fitness data
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% % y1 = sin(2*pi*x1);
% % y2 = sin(2*pi*x2);
figure(1)
% plot on large axes
plot(x1, y1, 'LineWidth', 2)
grid on;
ax1 = gca; % Store handle to axes 1.
% Create smaller axes in top right, and plot on it
% Store handle to axes 2 in ax2.
ax2 = axes('Position',[.7 .7 .2 .2])
box on;
plot(x2, y2, 'b-', 'LineWidth', 2)
grid on;
% Now draw something back on axis 1
hold(ax1, 'on'); % Don't blow away existing curve.
y1b = cos(2*pi*x1/3);
plot(ax1, x1, y1b, 'r-', 'LineWidth', 2);
% Now draw something back on axis 2
hold(ax2, 'on'); % Don't blow away existing curve.
y2b = cos(2*pi*x2/3);
plot(ax2, x2, y2b, 'r-', 'LineWidth', 2);

but it gives me an empty figure window and the following eror:

Unrecognized function or variable 'y1'.

Error in histoImageAnalyst1 (line 24)

plot(x1, y1, 'LineWidth', 2)

Walter Roberson 2022-11-20

If you have data that is not yet had the bins analyzed, then use histogram()

If you have counts for each bin then call bar(BINLOCATIONS, COUNTS)

Sadiq Akbar 2022-11-20

Thank you very much dear Walter Roberson for your kind response. Each variable "one" has 100 different values. So if we show the x-axis as logrithmic and the y-axis will show count values from 1 to 100. Actually someone said to me use "histcounts" and "histogram" and then he gave me the above code, but I don't understand it and also it doesn't give me the graph like the one in the attachment. I don't understand what does histcounts does and what does histogram does? And why do we write [~,edges1] as output arguments in hiscounts but doesn't write some output arguments in histogram. Further, x-axis is also not logrithmic like 10^-1, 10^-2, 10^-3,.....10^-10 etc.

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