# 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**

Question

How can I plot this date time graph?

Hi! I have this Years.mat timetable where I have three columns - a) date, b) hours of the date, and c) tide height. Can anyone...

24 hours ago | 2 answers | 0

### 2

answersQuestion

How can I extract a specific row from a table?

Hi all! Suppose I have a table with two column (i.e., Date and Temperature) like this - Please note that every date has mul...

1 day ago | 1 answer | 0

### 1

answerQuestion

How can I delete a specific row from a timetable?

Hi! Thank you for all the supports you guys always provide here. I have a question. I attached a timetable. It's a very simple ...

8 days ago | 1 answer | 0

### 1

answerQuestion

Important plotting question (defining the markers in a for loop)

Hi all, If I want to run this code in a for loop and plot everything with different markers, how can I do that? x = -2*pi:0....

8 days ago | 1 answer | 0

### 1

answerQuestion

How can I plot this X and Y data?

Hi coders! I have a very simple data (Data is attached as a .mat file) set but I want to know the most efficient way of plottin...

11 days ago | 2 answers | 0

### 2

answersQuestion

How to convert datetime to day of the year when there are more than one year?

Hi! If I have an array of datetime like this - '2003-10-14' '2003-11-07' '2003-11-15' '2003-11-23' '2004-01-10' '2004-04-...

2 months ago | 2 answers | 0

### 2

answersQuestion

Need suggestion -- which interpolation method should I use?

Hi all, I am working with a relatively sparse matrix with a lot of NaN values. As you can see from the attached picture - ...

2 months ago | 2 answers | 0

### 2

answersQuestion

Differentiation question - How to find out H vs. dH/dt from a list of height and datetime series?

Hi! I have a fundamental differentiation problem. I need to find out the derivative of the tide height (H) with repsect to time...

2 months ago | 1 answer | 0

### 1

answerQuestion

How to convert this string to a datetime?

Hi! Unfortunately, MATLAB is not allowing me to convert this series of strings of date to a datetime series. Can anyone please h...

2 months ago | 1 answer | 0

### 1

answerQuestion

How can I delete some specific rows from a matrix?

I have an easy question but somehow I am not being able to solve it. Suppose I have a datetime matrix, A where '2003-06-24'...

2 months ago | 2 answers | 0

### 2

answersQuestion

How can we insert a row matrix without altering the rest of the values?

Hi! Say, I have this matrix - A = 1 2 3 4 5 6 7 8 9 10 11 12 13 ...

2 months ago | 2 answers | 0

### 2

answersQuestion

Easy question - How can I save this variable within the for loop?

Hi! I have one easy question, but weridly I am not being to solve the problem. Say I have this very simple code - for n = 1:1...

2 months ago | 1 answer | 0

### 1

answerQuestion

How to code for summation?

Hi all, Can anyone please tell me how can I do the coding to complete this sum? Also, how can I write down the code that ad...

4 months ago | 1 answer | 0

### 1

answerQuestion

Simple question: How to set the complex part = 0 in an array?

Hi! I have this 1x5 matrix whicihcontains complex numbers - 2+0i; 3+3i; 5+0i; 8-4i; 6+9i; How can I set "only" the complex num...

5 months ago | 2 answers | 0

### 2

answersQuestion

How can I find the peak values of a curve?

Hi all! So I have these curves which have several peaks. Can anyone please tell me how can I detect the peaks and put a value t...

5 months ago | 2 answers | 0

### 2

answersQuestion

How can I divide/merge my subplots?

Hi! I want to plot this figure - As you can see, the first plot is taking the 3 columns. And the last 6 plots are taking...

6 months ago | 1 answer | 0

### 1

answerQuestion

How can I write multiple number (digit) in my title?

Hi! So, I have this mode array and I want to write this title - mode = [1,2,3,4,5]; title(sprintf('Mode: %d',mode(1,1))); Bu...

6 months ago | 1 answer | 0

### 1

answerQuestion

How to delete the columns that has NaN values?

Hi! I have this 5x5 matrix. Of them, only column 2 and 3 does not contain any NaN values. How can I write down a code that will...

6 months ago | 1 answer | 0

### 1

answerQuestion

How can I make these few lines a function?

Hi all! When I am plotting any graph (even for the individual subplot), I add these few lines everytime. set(gca,'color',[1 1...

6 months ago | 3 answers | 0

### 3

answersQuestion

How to calculate the rotation of this egg?

Hi all! Suppose I have this egg in figure1, standing still. But when it rotates a bit in figure 2, how can I calculate the rota...

6 months ago | 3 answers | 0

### 3

answersQuestion

Two easy questions (But I am confused)

Hi! Say I have a matrix S that is of 100x100 size. Now, I want to create an array just by taking the diagonal values of S. So...

6 months ago | 2 answers | 0

### 2

answersQuestion

How to manipulate xtick labels?

Hi! I am plotting a simple data set, say - plot(1:21,1:21); Now, obviously the x axis will show 1 to 21. But I want to chang...

7 months ago | 1 answer | 0

### 1

answerQuestion

How to concatenate in a for loop to make a 3D matrix?

Dear altruists, I have this Saved_Temp{} that has 10x1 cells. Each of the cell is 1130x800 double. I want to create a 3D cell t...

7 months ago | 1 answer | 0

### 1

answerQuestion

How to plot a geographical surface temperature heat map?

Dear altruists, I have this Temp_Data.mat file (attached) that contains Latitude (917x345), Longitude (917x345), and sea surfac...

7 months ago | 1 answer | 0

### 1

answerQuestion

Table to Array conversion using a for loop

Hi! Is there a way I can do this operation within a for loop? load 'temps-2021-11-16.mat' temps_2021_11_16 = table2array(data...

7 months ago | 2 answers | 0

### 2

answersQuestion

How to use str2num function to extract a specific year from the array?

Hi! I have a column matrix consists of string arrays. It's a huge time matrix and I am just showing a part of it. It contains d...

7 months ago | 1 answer | 0

### 1

answerQuestion

Plot legend in a bar graph

Hi all, Can anyone please tell me how can I plot the average of the bar (values of Y) in the bar graph? It can be a legend, or...

7 months ago | 2 answers | 0

### 2

answersQuestion

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...

10 months 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...

10 months 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...

10 months ago | 1 answer | 0