Community Profile # Ahmed

Active since 2013

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Starting and executing code in parallel is slower than expected
I installed MATLAB 2016a on three systems with different hard- and software and would like to use the Parallel Computing Toolbox...

6 years ago | 0 answers | 1

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How to find locations of multiple values within a matrix.
The function _ismember_ is what you are looking for. x=[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; y...

8 years ago | 6

| accepted

Stopping the neural network by tr.gradient
Maybe you are looking for the property “trainParam.min_grad”. net = fitnet(10); net.trainParam.min_grad % default 1e-7 n...

9 years ago | 2

| accepted

Solved

Beginner's Problem - Squaring
Try out this test problem first. Given the variable x as your input, square it by two and put the result in y. Examples: ...

9 years ago

how to compare the class of input and output,and display the misclassification,how much percentage it is classified properly
To just get the accuracy it is only required to count the number of matches and divide by the total number of observations: ...

9 years ago | 0

Simple question regarding plot
Given_data = rand(10,1); Obtained_data = rand(10,1); plot(zeros(size(Given_data)),Given_data,'r+'); hold on xlabel...

9 years ago | 0

| accepted

how compute color std fast
The std function can operate on any dimension. For details see the help of 'std'. newimg = std(imd,0,3); It might be fas...

9 years ago | 1

How to train a Neural Network with an input data set that comprises of numeric values as well as nominal variables (such as the base fluid used which could be either 'Water', 'Oil' or 'Slickwater')?
Try to code your nominal variables as dummy binary variables, then input that into your neural network. nomvar = nominal(ra...

10 years ago | 0

how get k space data from MRI dicom images
Note, that I am by no means an expert and that this question is not even related to Matlab. However, here is my opinion: Answ...

10 years ago | 0

HOW TO PERFORM THIS EQUATION IN MATLAB?u=∑_(i=1)^t▒(i*p_i/w)
Here is a minimal example with random data. The last line is the actual answer to your question. t = 100; p = rand(1,t);...

10 years ago | 0

| accepted

How should I make A and b matrix in fmincon function?
fmincon is for minimization of a function under linear constraints A*X<=b. As you gave no information about your constraints, no...

10 years ago | 0

| accepted

Solved

Swap the first and last columns
Flip the outermost columns of matrix A, so that the first column becomes the last and the last column becomes the first. All oth...

10 years ago

Solved

Most nonzero elements in row
Given the matrix a, return the index r of the row with the most nonzero elements. Assume there will always be exactly one row th...

10 years ago

Solved

Make a checkerboard matrix
Given an integer n, make an n-by-n matrix made up of alternating ones and zeros as shown below. The a(1,1) should be 1. Example...

10 years ago

Solved

Find all elements less than 0 or greater than 10 and replace them with NaN
Given an input vector x, find all elements of x less than 0 or greater than 10 and replace them with NaN. Example: Input ...

10 years ago

Column-wise dot-products of two gpuArrays
A possible solution (I hope it will be helpful to someone): C = sum(gpuArray(A).*gpuArray(B));

10 years ago | 0

| accepted

Solved

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...

10 years ago

Solved

Select every other element of a vector
Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

10 years ago

Solved

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

10 years ago

Solved

Find the sum of all the numbers of the input vector
Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

10 years ago

Solved

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

10 years ago

Solved

Swap the input arguments
Write a two-input, two-output function that swaps its two input arguments. For example: [q,r] = swap(5,10) returns q = ...

10 years ago

Solved

Is my wife right?
Regardless of input, output the string 'yes'.

10 years ago

Solved

Times 2 - START HERE
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

10 years ago

Solved

Make the vector [1 2 3 4 5 6 7 8 9 10]
In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

10 years ago

Question

Column-wise dot-products of two gpuArrays
Is there a good way to compute column-wise dot-products of two matrices of same size when stored on the GPU? Specifically, say A...

10 years ago | 1 answer | 0

### 1

How to declare kfun function in svmtrain
data = randn(100,10); groups = rand(100,1)>0.5; g = 1; r = 1; svmstruct = svmtrain(data, groups, ... 'Kernel_...

10 years ago | 0

Error:Undefined function or method 'gpuArray' for input arguments of type 'uint8'
gpuArray is a function of the 'Parallel Computing Toolbox'. Without this toolbox, the function can not be called. The command 'v...

10 years ago | 0