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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 ...

10 years ago | 0

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Change element of a matrix in a row
help imfill

10 years ago | 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)...

10 years ago | 0

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Answered
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...

10 years ago | 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...

10 years ago | 0

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Answered
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.

10 years ago | 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...

10 years ago | 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) = [];...

10 years ago | 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])

10 years ago | 0

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Apply a filter to an image
help imfilter

10 years ago | 0

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

10 years ago | 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);

10 years ago | 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...

10 years ago | 0

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Answered
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.

10 years ago | 0

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

10 years ago | 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))

10 years ago | 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'))

10 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));

10 years ago | 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....

10 years ago | 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...

10 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 ....

10 years ago | 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...

10 years ago | 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])')

10 years ago | 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...

10 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); %...

10 years ago | 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...

10 years ago | 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 ...

10 years ago | 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))];

10 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...

10 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.

10 years ago | 0