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Extract matrices out of a symbolic matrix
It looks like you are trying to extract the diagonal, upper triangular and lower triangular parts of the matrix. These commands ...

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Warning: The solutions are parameterized by the symbols: z
The function |solve| is part of the Symbolic Math Toolbox. Are you defining the symbolic variables? If I run this code syms...

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How to calculate value using different matrix using if and for loop
In the line if abs(b) < 14.5 the condition is looking at the entire 100 x 1 vector |b|, and the condition is only true i...

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How can we plot a function with domain involving infinity
Of course, you can't plot the whole thing, but you can plot enough so that it's obvious where the curve is going. One approach i...

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How can I change a certain part of a graph to a certain constant value?
Here is one way: y(x>=0.2*pi & x<=0.8*pi) = sin(0.2*pi); Note that I use inequalities because there are no values of |x|...

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Convert complex double to double type
Judging by the discussion in the <http://stackoverflow.com/questions/37320761/convert-complex-double-to-double-type-in-matlab St...

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what does this line means in the following code? I=I(200:400,250:450,:); and when i change the ratio there comes an error of "index exceeds matrix dimensions"
The function <https://www.mathworks.com/help/matlab/ref/imread.html imread> retrieves a 3D array consisting of 2D images in vari...

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How to plot a single collection of points
You need to separate the x and y coordinates. Here is one solution: data = [X{:}]; xdata = data(1,:); ydata = data(2,:) p...

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findpeaks() neglecting the high amplitude peaks.Does not work as exptected
When I try this code, I get 7 plots, and figure 7 looks like your figure except that all the peaks are correctly identified: ...

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Double Integral using Integral2 Error
Based on the above discussion, the critical part of code you need is as follows: myfun_eq8=@(phi) exp(f*phi).*cos(phi).*sin...

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Extract every subexpression in a symbolic expression between + and -
Depends whether you have muPAD. In the Symbolic Toolbox, you can use E = expand(E); to separate the terms, but then you ...

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How do I call and multiply handles from an array in integral or quad function?
You can replace B by a cell array of functions, and then call the functions when it's time to integrate: Bfuns = {@(x) ones...

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Storing a struct in a cell
Try curly brackets: groupavg{:,i} = averages.timelock.(subject{i}); This places the RHS _inside_ the cell element instea...

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In an assignment A(:) = B, the number of elements in A and B must be the same.
Look at the first part of a line of code in |projectmatrix.m|: dx(2) = ((k1 - k2)/m1)*u1 On the left side, you have a sc...

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Simplify symbolic expression for optimized code generation
I don't know how particular you are about the exact form of the simplified expression, but this certainly produces a simpler exp...

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How to calculate euclidean distance for 3 vectors using matlab
You can find the Euclidean distance between two vectors |v1| and |v2| using <http://www.mathworks.com/help/matlab/ref/norm.html ...

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What answers should be "Answer of the week"?
Here is <http://www.mathworks.com/matlabcentral/profile/authors/869215-john-d-errico John D'Errico> again, answering the questio...

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one thing i need to know
For your specific problem, some useful pages are <http://www.mathworks.com/company/newsletters/articles/matrix-indexing-in-matla...

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smooth a surface plot
You can make a mesh: [P1,P2] = meshgrid(P1,P2); Then use |interp2|. *EDIT:* Corrected typo.

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how to count the total number of recursion ?
The problem is that you're not passing |num| to |collatz|, so how can it know how many times it has been called? Here is a versi...

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Add values to a Matrix
If you're trying to collect all the values for the inner loop ( |for i=1:fil| ), you could try putting M = []; above the...

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Plotting 10 graphs with different colors and markers
There is a table in <http://www.mathworks.com/help/matlab/ref/linespec.html LineSpec (Line Specification)> with 13 different mar...

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Unnest a Matrix of strings
If I understand what you're trying to do, you can't do it. A 3x3 matrix of strings looks like this: ['abc';'def';'ghi'] ...

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Simple question about plotting a convolution
Your code will give you a vector of length |length(y1)+length(y2)-1|, so you'll get an error if you plot it against |x| (which i...

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Inner matrix dimensions must agree.
Note the top error statement: Inner matrix dimensions must agree. Have you tried testing these functions with vector arg...

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Help on sign function argument
Use 2*sign(x-0.01)-1

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How to Create Libraries in Matlab?
The simplest approach would be to put the functions in their own folder and add that folder to the <http://www.mathworks.com/hel...

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Make Smooth Curves using the points
The reason your points are not connected is that you are plotting them one at a time. You need to create some vectors and plot t...

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How to reproduce MATLAB's normal distribution random numbers?
I did a quick search, and found <https://github.com/numpy/numpy/issues/2047 Patch with Ziggurat method for Normal distribution (...

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