# Ahmad Hasnain

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Question

Modifying a matrix such that each entry can be written in a block of four

Hi, I have a matrix, say A = [1 2 3 4]; I want to modify it in such a way that it can be written as A = [1 1 2 2 ...

5 months ago | 2 answers | 1

### 2

answersQuestion

How to find x and y coordinates in a black and white image?

I have a black and white image. I want to find the coordinates of the outline of the black blob. I want these coordinates so tha...

2 years ago | 1 answer | 0

### 1

answerQuestion

How to save indices of a certain region of a matrix

I have a matrix, let's say A A = [1 2 3 4; 5 6 7 8; 9 10 11 12; 13 14 15 16]; I have another matrix, let's say B B = A(3:end,...

2 years ago | 2 answers | 0

### 2

answersQuestion

Reading data from cell array

I have a cell array that contains all the data. A{1,1}, A{2,1},...A{37,1}. Now, I want to extract the first row from A{1,1}, A{...

3 years ago | 1 answer | 0

### 1

answerQuestion

Reading data from csv files

I have 37 csv files. I need to read data from first row of all the 37 files and merge these 37 rows into one mat file. Then I w...

3 years ago | 1 answer | 0

### 1

answerQuestion

Merging multiple csv files into one mat file

I have multiple csv files (37 files). Every csv file has a column and it want to merge it into one mat file so that I get a mat ...

3 years ago | 1 answer | 0

### 1

answerQuestion

Creating a Sparse Matrix

I have a big matrix B and I get it by concatenating the small matrices. B = [A1 M1 M2 Z1 M1' M2' Z2 A2]; But w...

3 years ago | 0 answers | 0

### 0

answersQuestion

I want to change value of a variable after every 10 iterations

I am doing 100 iterations. I have a variable gamma that multiplies with a vector a. I want to update the value of gamma after ev...

3 years ago | 1 answer | 0

### 1

answerQuestion

How to half the value of a constant inside an iteration?

I have an iteration loop. Inside the loop, I have a constant gamma. I want its starting value to be 10e-8. I want to half its va...

3 years ago | 1 answer | 0

### 1

answerQuestion

Putting column vector in a matrix

for i = 1:N for row = 1 : n for col = 1:m grad(row,col)= .... %%%% I get a n x m matrix %%%% ...

3 years ago | 1 answer | 0

### 1

answerQuestion

How to add columns to form a matrix?

I am calculating a column vector in a FOR loop. I get N columns and I want to put them in a matrix. for i = 1: N dc(i) = ....

3 years ago | 3 answers | 0

### 3

answersHow to multiply arrays in struct file with a variable?

Thanks. The answer was very helpful.

3 years ago | 0

Question

How to multiply arrays in struct file with a variable?

I have four variables that are known to me, i.e. 'high', 'low' and 'a' and 'b'. I have a mat file, which contains a lot of array...

3 years ago | 2 answers | 0

### 2

answersQuestion

How to compare a number with values of a vector?

I have a vector. For example A = [20 40 60 80 100 120] I have a number as an input in a function function imp(omega...

3 years ago | 1 answer | 0

### 1

answerQuestion

How to compare a number with all the values of a vector?

*I have the following function: * function Z = imp (alpha) *% alpha is a scalar* A = [10 20 30 40 50 60 70] ...

3 years ago | 2 answers | 0

### 2

answersQuestion

How to create array with unequal spacing?

I want to create an array with unequal spacing. I have h = 1 1/2 1/4 1/8 ..... 2^-60. Every second entry in this array is 1/2...

4 years ago | 1 answer | 0

### 1

answerQuestion

Calling a function with vector as input

I have a function: function [U] = FE (nelx, nely, o) As nelx=4, nely=4 and o=2 I could simply call it by writing FE(4,4,2). ...

4 years ago | 0 answers | 0