# Ashfaq Ahmed

I am a first-year Ph.D. student at Brown University. My research interest lies in sea-ice dynamics, and transport phenomena.

**Programming Languages:**

Python, MATLAB

**Spoken Languages:**

Bengali, English, Hindi, Spanish

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**Content Feed**

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How can I find out the indices of the largest 10 values within the matrix?

Hey guys, I am facing a problem and I am sensing the solution should be relatively easy. Suppose I have a 100x100 matrix wit...

22 days ago | 1 answer | 0

### 1

answerQuestion

How can I locate a vortex center?

Hi all! Someone in the MATLAB community once asked similar kind of question but unfortuinately, it was never answered. So, I a...

24 days ago | 1 answer | 0

### 1

answerQuestion

How to run this code in a for loop?

Hi all! I have a code that requires to go to the folder, calls mat files and then plot images. I want to run everything in a f...

1 month ago | 1 answer | 0

### 1

answerQuestion

How to show bathymetry in a polar stereographic plot (ArcticMappingTools)?

Hi all! I am doing a particle relelase experiment in the arctic region and I have produced this trajectory paths of three parti...

1 month ago | 0 answers | 0

### 0

answersHow to save figure frames as gif file?

Thanks! I actually solved it by using this script - for i = 1:Leng figure(1); filename = 'Day02_Path.gif'; set...

1 month ago | 0

Question

How to save figure frames as gif file?

Hi all, I am having a problem while saving my figure frames as a gif file. I am using this code - for i = 1:Leng figure(...

1 month ago | 2 answers | 0

### 2

answersQuestion

Selecting .tif files from a folder and copy them to another folder

Hi! I have these 34 days folders and each folder contains 3 images (.tif) files. I want to select all these .tif files and copy...

1 month ago | 1 answer | 0

### 1

answerQuestion

Interpolating NaN values within a matrix

Hi all! I have this 71x328 size matrix (It's actually a satellite swath data). Within it, the row 35, 36, and 37 are entirely N...

2 months ago | 1 answer | 0

### 1

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Integral of a matrix (x = integration(v)dt) to find x in each time step - how to get it?

Dear altruists, I have these (5x1 size) time steps - t1 = 5.000; t2 = 5.005; t3 = 5.015; t4 = 5.020; t5 = 5.025; For each...

2 months ago | 1 answer | 0

### 1

answerQuestion

Dealing with strings and numbers in a for loop.

Hi guys, I have April2003 = 55; April2004 = 279; April2005 = 311; . . . . April20020 = 119 How can I run a for loop t...

2 months ago | 1 answer | 0

### 1

answerQuestion

How to assign different files in the target folders?

Hi all! Suppose, I have several files in a folder named like this: Please note that 20150408 means 2015-April-08. Now I wan...

2 months ago | 1 answer | 0

### 1

answerQuestion

How can I average the vectors within the grid cell?

Hi altruists, Suppose, I generated this simple vetor field using these few lines of codes: [X,Y] = meshgrid(0:6,0:6); U = 0....

3 months ago | 1 answer | 0

### 1

answerQuestion

How to select specific files from all the files in a folder?

Hi all, As you can see I have a lot of files in this folder, but I want only those files that contains '_020_' in it's name, an...

4 months ago | 2 answers | 0

### 2

answersQuestion

MATLAB is stuck at full screen!! - a weird problem

Hi all, I am facing a weird issue. I am curently working with the virtual desktop (high performance computer) of my university...

4 months ago | 2 answers | 0

### 2

answersQuestion

How to generate random coordinates and store the values?

Hi all, Suppose, I want to randomly create 5 different coordinates such as p(x,y) = (1,3), (-5,2), (8,1), (-4,4), and (6,3). A...

4 months ago | 1 answer | 0

### 1

answerQuestion

Algorithm to calculate trajectories from a vector field

Dear altruists, Suppose, I have a two-dimensional vector field, i.e., for each point (x, y) I have a vector (u, v), whereas u a...

4 months ago | 1 answer | 0

### 1

answerQuestion

How can I show the scale of my arrow in a quiver plot?

Hi! If I want to display the scale of my arrows on a quiver plot I got from my u and v velocities, how can I set the scale bar ...

4 months ago | 1 answer | 0

### 1

answerQuestion

How can I use the "diff" function instead of a for loop?

Dear altruists, How can I get the similar result from this few lines of code using the MATLAB built in "diff" function instead ...

5 months ago | 1 answer | 0

### 1

answerQuestion

How to write the code that takes input as fahrenheit and display Celsius?

Hi all, I want to write down the code that takes an input and covert it to the desired answer. for example, f = input('Enter ...

5 months ago | 1 answer | 0

### 1

answerQuestion

How to find out standard deviation of a matrix when there is a lot of NaN values?

Hi altruists, I have a 71*294 matrix that contains a lot of NaN values. In fact, the first 7 rows, the last 7 rows, and row ...

5 months ago | 2 answers | 0

### 2

answersQuestion

Quiver plot - how to use in this case?

Hi guys, I have my latitude matrix (71x259), longitude matrix (71x259), and the geostrophic current matrices (u, and v componen...

5 months ago | 1 answer | 0

### 1

answerQuestion

How can I make this simple code a for loop?

Hi, how can I represent this simple codes in a for loop? Also, can you please suggest me when I see a similar pattern in my code...

5 months ago | 1 answer | 0

### 1

answerQuestion

How can I plot my velocity data in a latitude longitude grid?

Hi altruists, I have these three matrices: lat (71x294), lon (71x294), and velocity(71x294). I want to plot the velocity vecto...

5 months ago | 0 answers | 1

### 0

answersQuestion

How can I insert NaN value in a matrix?

Suppose I have this matrix a = [1:6; 7:12; 13:18; 19:24] I want to fill the values for all the even number with NaN. How can I...

6 months ago | 1 answer | 0

### 1

answerQuestion

How can I increase the size of the color bar values?

Hi guys, can you kindly tell me how can I increase the values of these numbers showed in my color bar?

6 months ago | 1 answer | 0

### 1

answerQuestion

How to find pythagorean triangle's hypotenuse in a matrix?

Hey guys, I have two 4x4 matrices a and b. I want a third c matrix of 4x4 size where all the values will be c = sqrt(a.^2+b.^2)...

6 months ago | 3 answers | 0

### 3

answersQuestion

How to create a customized meshgrid?

Hi all, Can anyone kindly tell me how can I create a "71x9866 double" size meshgrid where my x axis will have the range of 34...

7 months ago | 1 answer | 0

### 1

answerQuestion

Create a matrix using rand function with a value range

Hi all, how can I create a 50x50 matrix using Random (rand) function while the condition is all the values of the matrix will be...

7 months ago | 1 answer | 0