Matlab Introduction - My command history

I have demonstrated few tips in MATLAB. Here is my command history:

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%-- 22/2/16 4:20 PM --% clear clc pwd cd '..' pwd cd '~/Desktop/Digital Image Processing/Course documents/' mkdir('matlab') dir cd matlab/ dir(..) dir('..') I = imread('../parrots.jpg'); imshow(I) ones(3) Ir = ones(50)*255; Ig = ones(50)*255; Ib = zeros(50)*255; clearvars I I(:,:,1) = lr; I(:,:,1) = Ir; I(:,:,2) = Ig; I(:,:,3) = Ib; Ipr = imread('../parrots.jpg'); imshow(I) imshow(uint8(I)) Ifurkan = I/2; Ifurkan(1:3,1:3,1) imshow(Ifurkan) figure,imshow(I) imshow(uint8(Ifurkan)) doc imshow imshow(rgb2gray(Ipr),[0.8 , 0.9]) imshow(rgb2gray(Ipr),[0.5 , 0.9]) imshow(rgb2gray(Ipr),[0.1 , 0.9]) imshow(rgb2gray(Ipr),[100 , 200]) doc image processing imshow(Ipr) Igr = rgb2gray(Ipr); imshow(Igr) imhist(Igr) Ihe = histeq(Igr); imshow(Ihe) imhist(Ihe) f = Ihe(100,:); plot(f) stem(f) F = fft(f); stem(f);figure,stem(F) F(1:5) stem(abs(F)) close all stem(abs(F)) t=linspace(0,1,100); c = cos(2*pi*t); stem(c) c = cos(2*pi*t*30); stem(c) c2 = cos(2*pi*t*20); c3 = cos(2*pi*t*5); call = c+c2+c3; stem(call) stem(abs(fft(call)))