Answered
I need to take characters out of a string using isnan and str2double.
cellfun(@(x) sscanf(x, '%f'), regexp(a, '(\d+)', 'match'))

7 years ago | 0

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Answered
How to extract coordinates from the pattern
white = 1; % or 255, depending on the format of your image [cy, cx] = ind2sub(size(I), find(I==1));

7 years ago | 0

Answered
Plotting bar graph using loop
A=xlsread(filename); for i = 1:3, h = histogram(A(:,i+1), [0 0.3 0.5 Inf]); hi(i,:) = h.Values; end bar(hi) legend({'0:0....

7 years ago | 0

Answered
three types of correlation coefficients for an image
I = im2double(imread('cameraman.tif')); c_diag = corrcoef(I(1:end-1, 1:end-1), I(2:end, 2:end)) c_vert = corrcoef(I(1:end-1...

7 years ago | 0

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Answered
Why is my Plot Blank?
You don't need the for loop, you can work on the vector beta. You just have to replace * and / with .* and ./ (you already use ....

8 years ago | 0

Answered
Finding a chain in an adjacency matrix
You can use the power of the adjacency matrix as detailed in <http://math.stackexchange.com/questions/222429/graph-theory-sh...

8 years ago | 0

Answered
want to make a number of row matrix from a single row matrix
Your description is somewhat unclear to me. Do you mean cat(3, reshape(line1, [3 3])', reshape(line2, [3 3])')

8 years ago | 0

Answered
line profile adding certain rows together
ind = [-3 -2 2 3] + rMiddle; % rows +/- 3 pixels from rMiddle, but without row rMiddle and the direct rows +/- 1 pixels ab...

8 years ago | 0

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Answered
How to select two matrices randomly from a set of N matrices and then randomly select a few rows from first selected matrix and then exchange with corresponding rows of other selected matrix.
Q = cat(3,A,B,C,D,E,F,G,H,I,J); kk = randperm(size(Q, 3), 2); % select 2 matrices from Q ii = randperm(size(Q, 1), 2); %...

8 years ago | 1

Answered
row-column confusion with squeeze
Squeeze squeezes out all singleton dimensions of X, *if X is not a matrix*. In case of C = squeeze(zeros(1,3,1)) who...

8 years ago | 1

Answered
How to find unique elements in a vector without using unique or find?
You can do this with for and if: suppose you have the numbers in x and want to generate the unique numbers in xu ...

8 years ago | 0

Answered
Merge a piecewise, parameterized Function
You can use logical indexing x = 1:100; y = [sin(x(x <= 20)) cos(x(x>20 & x <= 40)) tan(x(x>40))];

8 years ago | 0

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Answered
Undefined function 'x0' for input arguments of type 'double'.??
You try to evaluate x0(4*n) and it seems that x0 is not defined. It could be a variable, if 4*n is an index, or a functi...

8 years ago | 0

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Answered
Only the last user input is being stored, the rest are being replaced by zeros in my array.
Move the fprintf(fid1, '%6.3f,',n,y,x,z); inside the for loop.

8 years ago | 0

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combining planes of data
M = cat(3, plane1, plane2, plane3,[more planes], plane512);

8 years ago | 1

Answered
Simple way to wrap quotes around input
str = ['''' str ''''];

8 years ago | 1

Answered
How to mirror matrix on the diagonal?
I2 = rot90(fliplr(I),-1);

8 years ago | 4

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Answered
I have a problem with a plot
plot(x, y1); hold on plot(x, y2) or plot(x, y1, x, y2)

8 years ago | 1

Answered
Low computation efficiency of simple sentence in MATLAB
Instead of X = repmat(lambda_old1,1,4).*[W1(:,i),W3(:,i),W2(:,i),W4(:,i)]; if might be faster to use X = bsxfun(@time...

8 years ago | 1

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Answered
How can I correct inhomogeneous intensity in image?
I = im2double(imread('blob.bmp')); y = mean(I(:, 1:100), 2); sigma = 30; % choosen by visual inspection G = f...

8 years ago | 0

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Answered
How can I solve the " Index exceeds matrix dimensions" error for the following code ?
Don't use negative indices like -2, they are always invalid. Valid indices in Matlab start with 1 and end with the number of ele...

8 years ago | 0

Answered
reading a .txt
First check if the encoding is ISO-8859-1, such that accents are read correctly: if ~strcmp(feature('DefaultCharacterSet'), ...

8 years ago | 0

Answered
i have to save colour thresholded images in different folder according to their rgb values , but i can't work ..all the images are showing with the imshow() function but it can't stored on different folder as per their rgb values..pls help this out
Something is wrong with your condition, "out" is undefined. You can write if(red>88 & red<111 & green >86 & green <104 &...

8 years ago | 0

Answered
Randomize three chosen arrays in matlab
A = [0,0,1]; B=[0,1,0]; C=[1,0,0]; X = [A; B; C]; x = X(sub2ind(size(X), 1:3, randi(3, [1, 3])))

8 years ago | 0

Answered
concatenate all value in a matrix into one number
This works even if the numbers are not single digits, i.e., in in {1,2,...,9} v = [10 20 4]; num = sscanf(sprintf('%d', v...

8 years ago | 0

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Answered
Connecting line between different points obtained from a for-loop
x = 1:20; y = x+2; plot(x,y,'*-')

8 years ago | 0

Answered
Matlab delete's value's from array
You remove all rows that contain a NaN in the line k(any(isnan(k),2),:)=[]; and then you assign the variables varia...

8 years ago | 0

Answered
how can i find the displacement in pixels for the 1st, 3rd and 5th squares in the picture
% number here found by visual inspection I = im2double(imread('1.JPG')); index_center = size(I,2)/2+100:size(I,2...

8 years ago | 1

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Answered
Change the default filling of a matrix
I do not know anyway to change the default behaviour of Matlab to fill the empty positions with zeros. So you have to do it in t...

8 years ago | 0

Answered
Trying to make a "snake" matrix?
N = 5; M = 9; T = reshape(1:M*N, [M, N])'; T(2:2:end,:) = fliplr(T(2:2:end,:));

8 years ago | 0

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