MATLAB: How to write a program to investigate whether a number belongs to matrix

whether a number belongs to a matrix

I have a Matrix named A and a number like B=11. I want to write a program which gives C=1 when B belongs to A and C=0 when B doesn't belong to A. I'm really interested in Matlab special features instead of long codes in my program.

e.g:

A=[1 2 3 5 21 2 4 0 11 3]

if B=11 then C=1

if B=9 then C=0

Best Answer

I think ismember() should do the trick:

A=[1 2 3 5 21 2 4 0 11 3];
B = 11;
C = ismember(B, A);  %returns 1
B = 9;
C = ismember(B, A);  %returns 0

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Sort of close, but you're not creating an image like they want. I think you need to create an image and then display it with imshow(), more like this:

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables.
workspace;  % Make sure the workspace panel is showing.
format longg;
format compact;
fontSize = 20;
dx=0:0.01:1.99;
dy=0:0.01:1.99;
numberOfColumns = length(dx);
numberOfRows = length(dy);
sxy = zeros(numberOfRows, numberOfColumns);
%a.u0=2 and v0=0
u0=2;
v0=0;
%a.A(vertical shift)=50, B(Amplitude)=0
A=50;
B=0;
for row = 1 : numberOfRows
  dyThisRow = dy(row);
  s = sin(2*pi*(u0.*dx+v0*dyThisRow));
  thisRow = (A+B*(sin(2*pi*(u0.*dx+v0*dyThisRow))));
  sxy(row,:) = thisRow;
end
subplot(2,2,1);
imshow(sxy, [0 75]);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
xlabel('0\leqx\leq1.99', 'FontSize', fontSize);
title('Plot of sin(4\pix)+50', 'FontSize', fontSize);
%b.u0=2 and v0=0
u0=2;
v0=0;
%b.A(vertical shift)=50, B(Amplitude)=10
A=50;
B=10;
for row = 1 : numberOfRows
  dyThisRow = dy(row);
  thisRow = (A+B*(sin(2*pi*(u0.*dx+v0*dyThisRow))));
  sxy(row,:) = thisRow;
end
subplot(2,2,2);
imshow(sxy, [0 75]);
xlabel('0\leqx\leq1.99', 'FontSize', fontSize);
title('Plot of 10sin(4\pix)+50', 'FontSize', fontSize);
%c.u0=2 and v0=0
u0=2;
v0=0;
%c.A(vertical shift)=50, B(Amplitude)=25
A=50;
B=25;
for row = 1 : numberOfRows
  dyThisRow = dy(row);
  thisRow = (A+B*(sin(2*pi*(u0.*dx+v0*dyThisRow))));
  sxy(row,:) = thisRow;
end
subplot(2,2,3);
imshow(sxy, [0 75]);
xlabel('0\leqx\leq1.99', 'FontSize', fontSize);
title('Plot of 25sin(4\pix)+50', 'FontSize', fontSize);
%d.u0=2 and v0=0
u0=2;
v0=0;
%d.A(vertical shift)=50, B(Amplitude)=50
A=50;
B=50;
for row = 1 : numberOfRows
  dyThisRow = dy(row);
  thisRow = (A+B*(sin(2*pi*(u0.*dx+v0*dyThisRow))));
  sxy(row,:) = thisRow;
end
subplot(2,2,4);
imshow(sxy, []);
xlabel('0\leqx\leq1.99', 'FontSize', fontSize);
ylabel('s(x,y)', 'FontSize', fontSize);
title('Plot of 50sin(4\pix)+50', 'FontSize', fontSize);

Best Answer

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