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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 ...

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Change element of a matrix in a row
help imfill

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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)...

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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...

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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...

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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.

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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...

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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) = [];...

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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])

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Apply a filter to an image
help imfilter

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

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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);

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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...

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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.

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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>

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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))

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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'))

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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));

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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....

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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...

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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 ....

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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...

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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])')

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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...

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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); %...

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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...

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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 ...

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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))];

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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...

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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.

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