MATLAB: How to get the Command Window to recognize variables created in a function

function defined variablessimulink

function [K,T] = KTBC(n)
%Create the four special matirces assuming n>1
K=toeplitz([2 -1 zeros(1,n-1)]);
T=K;T(1,1)=1
end
%Won't display T and K in command window

Best Answer

Because you have to do something like this on the command window:

[K,T] = KTBC(n)

KTBC is a function that take an input 'n' and gives two variable output. Unless you specify a name for those variables while running the function, it will go ans variable

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The function was defined before k. When the anonymous function is created, it grabs a static snapshot of the workspace and does not update. To incorporate k, just rerun the command to create the function handle.

MATLAB: Recognize black dot

Well now that you posted an image, and I see you have black spots not only on the dice but also on the red background, I need to modify my answer to have you threshold on the blue or green channel:

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
imtool close all;  % Close all imtool figures.
clear;  % Erase all existing variables.
workspace;  % Make sure the workspace panel is showing.
fontSize = 20;
folder = 'C:\Documents and Settings\user\My Documents\Temporary stuff';
% Read in a color demo image.
baseFileName = 'IMG_0584.JPG';
fullFileName = fullfile(folder, baseFileName);
% Get the full filename, with path prepended.
fullFileName = fullfile(folder, baseFileName);
if ~exist(fullFileName, 'file')
  % Didn't find it there.  Check the search path for it.
  fullFileName = baseFileName; % No path this time.
  if ~exist(fullFileName, 'file')
    % Still didn't find it.  Alert user.
    errorMessage = sprintf('Error: %s does not exist.', fullFileName);
    uiwait(warndlg(errorMessage));
    return;
  end
end
rgbImage = imread(fullFileName);
% Get the dimensions of the image.  numberOfColorBands should be = 3.
[rows columns numberOfColorBands] = size(rgbImage);
% Display the original color image.
subplot(2, 2, 1);
imshow(rgbImage, []);
title('Original color Image', 'FontSize', fontSize);
% Enlarge figure to full screen.
set(gcf, 'Position', get(0,'Screensize')); 
% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);
spots = blueChannel < 128;
subplot(2, 2, 2);
imshow(spots, []);
title('Thresholded Blue Channel', 'FontSize', fontSize);
spots = imclearborder(spots);
subplot(2, 2, 3);
imshow(spots, []);
title('Border Cleared', 'FontSize', fontSize);
% Fill holes
spots = imfill(spots, 'holes');
subplot(2, 2, 4);
imshow(spots, []);
title('Final Spots Image', 'FontSize', fontSize);
% Count them
[labeledImage numberOfSpots] = bwlabel(spots);
message = sprintf('Done!\nThe number of spots (total on both dice) is %d', numberOfSpots);
msgbox(message);

Best Answer

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MATLAB: Undefined Function or Variable but the variable is in fact Defined

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