(Important )How to generate numbers in matlab? Need help.

Hi everyone. I have a question. I want to make an automatic image rescaling using a random number as follow. How can i make it so that xb variable will be bigger than xa variable as the function randscale stated than xb cannot be same and bigger than xa? I think using linspace also gives me error. Thanks for helping.

clear;
clc;
img1 = imread('peppers.png');
data=100;
for i=1:data
    xmin=0.001;
    xmax=1;
    n=data;
    xa=fliplr(round(xmin+linspace(1,n)*(xmin+xmax)));
    xb=round(xmin+linspace(1,n)*(xmax-xmin));
    augmenter = imageDataAugmenter('RandScale',[xa xb]);
    S=augment(augmenter,img1);
    imwrite(S, [pathname '\' fol '_imagescaling' num2str(i) '.png']);
end

Answer 1

[Chunru]

You can generate 2 random numbers in the given range and sort these 2 numbers out.

img1 = imread('peppers.png');
data=5; %100;
for i=1:data
    xmin=0.001;
    xmax=1;
    % n=data;
    % xa=fliplr(round(xmin+linspace(1,n)*(xmin+xmax)));
    % xb=round(xmin+linspace(1,n)*(xmax-xmin));
    xab = rand(1, 2)*(xmax-xmin) + xmin;
    xab = sort(xab);
    
    %augmenter = imageDataAugmenter('RandScale',[xa xb]);
    augmenter = imageDataAugmenter('RandScale', xab);
    S=augment(augmenter,img1);
    %imwrite(S, [pathname '\' fol '_imagescaling' num2str(i) '.png']);
end

[Fitz Amin]

Thank you sir. It worked.

Answer 2

[yanqi liu]

clc; clear all; close all;
img1 = imread('peppers.png');
data=100;
for i=1:data
    xmin=0.001;
    xmax=1;
    %     n=data;
    %     xa=fliplr(round(xmin+linspace(1,n)*(xmin+xmax)));
    %     xb=round(xmin+linspace(1,n)*(xmax-xmin));
    rate = sort(abs(randn(1, 2)));
    augmenter = imageDataAugmenter('RandScale',rate);
    S=augment(augmenter,img1);
    imwrite(S, [pathname '\' fol '_imagescaling' num2str(i) '.png']);
end

[Fitz Amin]

Thank you sir for the knowledge. It also worked.