MATLAB: How do i plot a rectangle havng cetain dimensions and inside it even number of parametric cordinates such dat the centres of all cordinates and centre of rectangle coincide

code generationplot

i have to define a plan geometry in which my parametric input will be numb of columns..i wish to put columns in such a way dat dey are symetrically placed inside the rectangle..

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I don't understand the question. Please give a numerical example. Maybe you can define the midpoint

xMid = (xLeft + xRight) / 2;

Then calculate other x based on distances from that

% Set up.
numberOfColumns = 4
xLeft = 1;
xRight = 11;
spacing = 0.2;
% Do it:
xMid = (xLeft + xRight) / 2
incr = 1 : numberOfColumns;
xRight = xMid - spacing * fliplr(incr)
xLefts = xMid + spacing * incr

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MATLAB: Image mask – apart from rectangle in the center

Hi John,

It is my understanding that you are able to create an image masked outside of a circular region, but would like to use a rectangular region instead. The key line to change in your code is the creation of the mask. Instead of finding all of the pixels outside of the circle, you are looking for all of the pixels that are to the left of the box, or the right of the box, or above, or below. This translates quite easily into a logical statement. See the code below for an example of a rectangularly-masked image:

% Acquire image
inputImage = imread('cameraman.tif');
% Determine image properties
[rNum, cNum, ~] = size(inputImage);
centerX = ceil(cNum/2);
centerY = ceil(rNum/2);
% Define parameters of the rectangle
windowWidth = 125;
windowHeight = 75;
% Create logical mask
[yy, xx] = ndgrid((1:rNum)-centerY, (1:cNum)-centerX);
mask = xx < -windowWidth/2 | xx > windowWidth/2 | ...
    yy < -windowHeight/2 | yy > windowHeight/2;
% Mask image and show it
maskedImage = inputImage;
maskedImage(mask) = 128;
imshow(maskedImage)

I hope this helps.

-Cam

MATLAB: How to plot 4 rectangles, having their center, and knowing their half width and heigh

help rectangle

The 'Position' parameter takes a vector of 4 values which are the location of the bottom/left corner (x,y) and the width and height. You have the center points and the width and height so you'll need to calculate the bottom/left corner position which should be straightforward.

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MATLAB: Image mask – apart from rectangle in the center

MATLAB: How to plot 4 rectangles, having their center, and knowing their half width and heigh

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