how to build a histogram from an output with 2 vectors

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Heg Vel 2020-10-13

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评论： Heg Vel 2020-10-18

I have a program that does the best selection from a file and choose the best trains to fit the weight=600 Tons and the highest nr of passengers. I want to execute the code multiple times and save output to create a histogram.

%display results:

if selection == zeros(chromosome_length, 1)

message = sprintf('GA CANNOT FIND VALID SELECTION WITH GIVEN CONSTRAINTS');

disp(message)

else

message = sprintf('OPTIMAL SELECTION OF ITEMS: [');

for i = 1:chromosome_length

if selection(i) == 1

message = sprintf('%s \n\t- %s', message, string(trains_table.Manufacturer(i)));

end

fprintf('%s\n ]\n', message);

fprintf('TOTAL weight OF RAILCARS: %d Tons\n', selection * trains_table.weight);

fprintf('TOTAL DAILY PASSENGERS: %d\n', selection * trains_table.daily_passengers);

end

Output is this:

Best fitness for this run = 13400

****GA Finished****

OPTIMAL SELECTION OF ITEMS: [

- Paynes Trains Limited Co.

- Motor Company of Maine

- Thomas The Engine Inc.

]

TOTAL weight OF RAILCARS: 600 Tons

TOTAL DAILY PASSENGERS: 13400

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Answer 1

Athul Prakash 2020-10-16

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https://ww2.mathworks.cn/matlabcentral/answers/613086-how-to-build-a-histogram-from-an-output-with-2-vectors#answer_515618

Hi Heg,

It seems that you haven't posted the code where the 'ga' algorithm is running and the results are obtained.

In general, I would recommend that you save the entire code to a file as a simple function which returns these outputs.

You can call the function multiple times in a loop to run 'ga' and populate a vector with the output of each run. Once you have a vector of all the outputs, the hist() function should help you create the desired histogram.

Hope it helps!

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Heg Vel 2020-10-16

Hi Athul.Thank you for reaching me out .This is the other part of the code from begining:

clc;

clear;

% set weight_limit, read input file into variable trains_table:

weight_limit=600;

input_file= 'Train_info.csv';

trains_table=readtable(input_file);

fprintf('******** READING ITEMS FROM %s ********\n',input_file);

fprintf('WEIGHT LIMIT IS SET TO %d\n',weight_limit);

% define chromosome length and fitness function:

chromosome_length= height(trains_table);

fit_func=@(chromosome)-(chromosome*trains_table.daily_passengers);

% define A, b, Lb, Ub, int_indices:

% we need a matrice to play a role of masks so one manufacturer can be

% selected once and for this we buid a diagonal ones matrix which would be

% the same in size with chromosome length

A=vertcat(trains_table.weight',eye(chromosome_length));

b=[weight_limit, ones(1,chromosome_length)];

Lb=zeros(1,chromosome_length);

Ub=ones(1,chromosome_length);

int_indices=1:chromosome_length;

% run ga:

disp('****GA STARTING*****');

options = optimoptions('ga','display','off');

[selection, selection_fitness] = ga(fit_func,chromosome_length,A,b,...

[],[],Lb,Ub,[],int_indices);

fprintf('Best fitness for this run = %d\n', abs(selection_fitness));

disp('****GA Finished****');

Athul Prakash 2020-10-18

If you're new to Matlab or want to brush up on the basics of the language, such as functions, loops, vectors etc, I would suggest going through the Matlab OnRamp course online. It's a great resource and may get you up to speed in short time.

https://www.mathworks.com/learn/tutorials/matlab-onramp.html

Heg Vel 2020-10-18

Thank you so much!

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how to build a histogram from an output with 2 vectors

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