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Interpolation between matrices (image attached)
Your query location, (0,10), is in the center of your grid, so if you want a linear interpolation between the input matrices you...

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difference between imadd and imfuse
Yes.

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Sum all integers from 1 to 2^n
Given the number x, y must be the summation of all integers from 1 to 2^x. For instance if x=2 then y must be 1+2+3+4=10.

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Free passes for everyone!
_Simply return the name of the coolest numerical computation software ever_ *Extra reward* (get a _freepass_): As an addit...

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Function Iterator
Given a handle fh to a function which takes a scalar input and returns a scalar output and an integer n >= 1, return a handle f...

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Remove any row in which a NaN appears
Given the matrix A, return B in which all the rows that have one or more <http://www.mathworks.com/help/techdoc/ref/nan.html NaN...

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Finding Perfect Squares
Given a vector of numbers, return true if one of the numbers is a square of one of the other numbers. Otherwise return false. E...

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Who Has the Most Change?
You have a matrix for which each row is a person and the columns represent the number of quarters, nickels, dimes, and pennies t...

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Fibonacci sequence
Calculate the nth Fibonacci number. Given n, return f where f = fib(n) and f(1) = 1, f(2) = 1, f(3) = 2, ... Examples: Inpu...

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Pizza!
Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

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Saving axes to file - trouble with copyobj and export_fig
Regarding the error using export_fig, it seems you didn't install the package correctly.

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export_fig can't do Monospace?
Export_fig supports Courier, and that is monospaced. For hints on why the other fonts you mentioned might not be working, see...

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Is there a way to make device memory persist between CUDA MEX calls
Yes, you can reinterpret_cast the pointer to an integer of a sufficient bit length, e.g. uint64, and return this to MATLAB. Then...

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Indexing multiple values over large array?
histc outputs the bin index of each input value in the second output argument. So you can do: [~, ind] = histc(vals); va...

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Gray Image to Color Indexed Image
Use the <http://www.mathworks.co.uk/matlabcentral/fileexchange/16233 sc()> package. A = sc(image, [0.4 1], 'hsv');

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PNG image created in Matlab shows up as all black in imshow
If you read the imshow help text, you'll see that the range only applies to grayscale images. Try: imshow(double(A)/4095);...

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How to optimise/vectorize loop containing the function "imrotate", using multiple images and angles as input
Assuming your 900 input images are all the same size, you could: # For each rotation angle, compute the location of each rota...

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Create times-tables
At one time or another, we all had to memorize boring times tables. 5 times 5 is 25. 5 times 6 is 30. 12 times 12 is way more th...

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Weighted average
Given two lists of numbers, determine the weighted average. Example [1 2 3] and [10 15 20] should result in 33.333...

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Triangle Numbers
Triangle numbers are the sums of successive integers. So 6 is a triangle number because 6 = 1 + 2 + 3 which can be displa...

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Column Removal
Remove the nth column from input matrix A and return the resulting matrix in output B. So if A = [1 2 3; 4 5 6]; and ...

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Add two numbers
Given a and b, return the sum a+b in c.

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bitget for array (count no. of bits)
I assume from your question that you actually want to do a vectorized bitcount, rather than a vectorized bitget. If that is corr...

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Which MATLAB operations/functions need speeding up?
Linear 2D interpolation for multi-channel images A common computation in computer vision, and many other fields, is sampling ...

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What functions can benefit from simple patching?
I gave a patch for saveas <http://www.mathworks.co.uk/matlabcentral/answers/13085#answer_17979 here>.

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Which MATLAB operations/functions need speeding up?
REPMAT Repmat is unnecessarily slow. Internally it produces an index array, which it then uses to create the output array. Th...

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Which MATLAB operations/functions need speeding up?
BSXFUN with builtin functions Bsxfun is useful in that it allows us to vectorize elementwise operations between arrays of dif...

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Which MATLAB operations/functions need speeding up?
When using MATLAB, I sometimes come across a performance bottleneck caused by functionality that I believe could be much faster....

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How should I compute the eigenvectors of a sparse, real, symmetric matrix?
Just convert the matrix to a full one, and use eig. Unless less you want just a few eigenvectors, then the decomposition using t...

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How should I compute the eigenvectors of a sparse, real, symmetric matrix?
I need to compute all the eigenvectors of a sparse, real, symmetric matrix, A. I've tried the following: >> [V, D] = eig...

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