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what is meant by index exceed matrics dimension?
If you have a 1 x 3 matrix A = [6 7 9] and try to access an element that does not exist, like A(2,3) or A(1, 4), you get ...

9年以上前 | 0

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Change element of a matrix in a row
help imfill

9年以上前 | 0

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Plotting points across the Sine Curve
plot(t, y) hold on ind = find(diff(y>0)<0); plot(t(ind), y(ind), 'ko') ind = find(diff(y>0)>0); plot(t(ind)...

9年以上前 | 0

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How would I check to see if the number of rows in one matrix are equal to the number of rows in another matrix?
You can use assert assert(size(A,1) == size(B, 1), 'Matrices have different numbers of rows.') If the condition given as...

9年以上前 | 0

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Detail lost showing images
900 x 1800 is pretty large. You can check the screen size using get(0,'ScreenSize') If your image fits on the screen...

9年以上前 | 0

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I understand the point of asking a question is to not automatically be given the answer. However I have no clue how to even approach the given questions that are mentioned below. I looked up a way to do it on the Matlab website already but am lost.
function g = grade(num) if num < 60 g = 'E' elseif num < 70 g = 'D' and so on.

9年以上前 | 0

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What font can I use to match my text to greek letters?
In which way are Matlab's default fonts for Greek and other characters not matching? You can change various properties, such...

9年以上前 | 0

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Ignore answers with imaginarey components
This is basically the implementation of Dr. Siva Srinivas Kolukula's answer: ind = ~isreal(C); A(ind) = []; B(ind) = [];...

9年以上前 | 0

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How to polarplot theta=3*pi/4 ?
theta = 3/4*pi; plot([0 cos(theta)], [0 sin(theta)]) axis equal axis([-1 1 -1 1])

9年以上前 | 0

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Apply a filter to an image
help imfilter

9年以上前 | 0

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converting matrix into image
I = im2double(imread('circuit.tif')); imshow(I)

9年以上前 | 1

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how to run a certain code loop for 'N' times and get 'N' number of output outside the loop.
You don't need the loop: A = rand(3, 5, N);

9年以上前 | 1

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How can I keep figures invisible when going between different figures and different subplots?
Don't use figure(2) but set(0, 'CurrentFigure', f(2)) where f(2) is the handle of figure 2, obtained with gcf wh...

9年以上前 | 0

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How to change gap between legend line and legend text?
You can increase the space by adding blanks ' ' in front of the legend entries. This is a hack, of course.

9年以上前 | 0

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How to draw nice dotted lines?
Check out <https://de.mathworks.com/matlabcentral/fileexchange/15743-fix-dashed-and-dotted-lines-in-eps-export>

9年以上前 | 1

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How can I plot an average line through this line graph
You store the values of each line in the rows of matrix X. Then use plot(mean(X))

9年以上前 | 3

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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'))

9年以上前 | 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));

9年以上前 | 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....

9年以上前 | 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...

9年以上前 | 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 ....

9年以上前 | 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...

9年以上前 | 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])')

9年以上前 | 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...

9年以上前 | 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); %...

9年以上前 | 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...

9年以上前 | 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 ...

9年以上前 | 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))];

9年以上前 | 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...

9年以上前 | 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.

9年以上前 | 0