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

8 years 前 | 0

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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));

8 years 前 | 0

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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....

8 years 前 | 0

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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...

8 years 前 | 0

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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 前 | 0

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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 前 | 0

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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 前 | 0

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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 前 | 0

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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 前 | 1

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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 前 | 1

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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 前 | 0

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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 前 | 0

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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 前 | 0

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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 前 | 0

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

8 years 前 | 1

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

8 years 前 | 1

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

8 years 前 | 4

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

8 years 前 | 1

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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 前 | 1

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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 前 | 0

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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 前 | 0

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

8 years 前 | 0

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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 前 | 0

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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 前 | 0

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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 前 | 0

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

8 years 前 | 0

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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 前 | 0

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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 前 | 1

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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 前 | 0

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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 前 | 0

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