MATLAB: How to display single points (-24,9) and (-18,3) in a plot ranging from x-co-ordinates: (-27,27) Y-co-ordinates: (-27,27) by dot

I want to trace a path of a robot starting from these 2 points. I would like to know how to inculcate previous plot in current

Best Answer

Is something like this what you mean?

figure
hold on
plot(-27:27,-27:27)
h = plot([-24 9],[-18 3],'.');
set(h,'MarkerSize',24)

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MATLAB: Finding the co-ordinates

st = regionprops(S, 'BoundingBox' )

eg:

z = randi(15,size(S))
ij = ceil(st.BoundingBox);
out = z(ij(2) + (0:ij(4)-1),ij(1) + (0:ij(3)-1))

added after the Kash's comment

Img = imread('Q8vjJ.png');
BW = im2bw(Img,graythresh(Img));
BW(:,1) = false;
BW2 = cumsum(BW,2) & fliplr(cumsum(BW(:,end:-1:1),2));
BW2 =  cumsum(BW2) & flipud(cumsum(BW2(end:-1:1,:)));
st = regionprops(SBW2, 'BoundingBox' );
imcrop(Img,st.BoundingBox + [-1 -1 1 1]);

MATLAB: Slope at defined co-ordinates

The gradient is simply the derivative, since yours is a univariate function. I would create a vectorized anonymous function from it, and use it as I would any other function:

dd_dx = @(x) (1303*x)/2500 - (4999*x.^2)/100000 + 25/2;

then call it as:

x = linspace(0, 10);
figure(1)
plot(x, dd_dx(x))
grid

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Related Solutions

MATLAB: Finding the co-ordinates

MATLAB: Slope at defined co-ordinates

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