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I have seen a plot in one page. I wanted to recreate a similar plot I searched for the code but could not find the code for the plot. Attaching the plot with this of which I wanted to generate in MATLAB
As an example, here's a plot for a dampened sine curve:
A=10;
f=1000;
n=5;
T=1/f;
t=[0:T/100:n*T];
s=A*exp(-t*1000).*sin(2*pi*f*t);
% Here is the bit you'd be interested in:
plot(t,s,'b-','lineWidth',2) %'b-' is blue line.
xlabel('time (s)')
ylabel('amplitude (v)')
set(gca,'linewidth',2)
grid on
ax = gca;
ax.XGrid = 'off';
ax.YGrid = 'on';
set(ax,'GridLineStyle','--')
Change the formula or data to achieve desired plot shape.
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I'm trying to make a confusion matrix for some classification problem.
So far, I've managed to make a 10 by 10 matrix that stores the accuracy of my estimation for classification problem.
Now I want to make a 10 by 10 square image(?) that has a darker color when the number in that location of the matrix has a higher number. (Ranges from 0 to 100)
I've never done graphics with Matlab before.
Any help would be greatly appreciated.
Thanks.
I would use image. For example:
img = 100*rand(4,4); % Your image
img = img./100*64; % The `image` function works on scale from 0->64
image(img); % or `image(img')` depending on how you want the axis
colormap('grey'); % For grey scale images
axis equal; % For square pixels
Or for inverted colours you can change the one line to:
img = 64-img./100*64;
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I want to create a grid in Matlab, I want mark some cell as free , some(blacks) as obstacle, and mark one cell as start and another cell as end point and some as path, like below image,how can I achieve this in Matlab?
To get you started, here's how to create something that looks like the image you included using pcolor.
A = ones(11,11)
A(5,1:3) = 0;
A(8:10,2:3) = 0;
A(5:7,6:7) = 0;
A(1:3,8:10) = 0;
pcolor(A)
colormap(gray(2))
% To flip the vertical axes, uncomment next line
%axis ij
For start and goal
patch([1,2,2,1],[2,2,3,3],[0.5 0.5 1]) % [r g b] values
text(1.25,2.5,'Start')
patch([10,11,11,10],[10,10,11,11],'g')
text(10.25,10.5,'Goal')
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I have above image with white background. I need to count the circles and get diameter of each circle using morphological, logical and set operations of matlab. Any ideas how to do it?
Use regionprops:
img = imread('http://i.stack.imgur.com/OJidJ.png');
bw = img(:,:,1) < 128; %// convert to logical mask
d = regionprops( bw, 'EquivDiameter' );
d = [d.EquivDiameter]; %// array with diameter of each coin.
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I have almost 1000 images of similar dataset all of them have black background and an object (skin cancer mole) . Now the problem is clear i.e the objects are in different orientation I want the objects in all images with same orientation.
MATLAB code will be recomended.
Answer found:
Check the two images of skin lesion mole shown below:
We assume that it comes from loop on folder(1000 images) in which they are at:
Code:
% I1= first image
I=imread(I1); %% Image input
BW = im2bw(I,0.004);
%%%%% Getting the biggest region (because if segmentation give unclear results)
[L, num] = bwlabel(BW, 8);
count_pixels_per_obj = sum(bsxfun(#eq,L(:),1:num));
[~,ind] = max(count_pixels_per_obj);
biggest_region = (L==ind);
%%%%%%
%%% getting orientation
s = regionprops(biggest_region, 'Orientation');
data=s.Orientation;
%%% Orientation end
Y = imrotate(I, -data, 'loose', 'bilinear');
figure;
imshow(Y)
%%% Now the rotated image will be shown as
%% Now write the image in any other folder
%% that have all images aligned
imwrite(Y, 'test.jpg');
%% Hope it will save time for other. Thanks
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I need to plot points in 3D in MATLAB. For example, look at this image:
The background represents a plane, and the color of each
point is dependent on its Z value. It is a 2D plot,
but if you plot this in 3D you should get a plane and points.
I did not create this image, and I wonder how to plot like this.
I need to make the colors of the points dependent on their Z value and
plot in 2D, or if I plot this in 3D how do I plot points in 3D?
THanks
use scatter3
scatter3(x, y, z, 'ob');
See doc here.