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# ANKUR KUMAR

### NASA IMPACT

Last seen: 9 days ago Active since 2017

Researching with NASA IMPACT |
MATLAB for fun | Python for research |

https://www.nsstc.uah.edu/users/ankur.kumar/

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Create a custom legend
You can add the legend manually and set the color and marker as per your own. See the below example for your reference. x = lin...

12 days ago | 0

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Import multiple xml.files in a folder
You can use the dir command to store the file names and use for loop to read all the files. F = dir('path/*.xml') for index = ...

2 months ago | 0

How to plot multiple lines (with a varying slope coefficient) in the same graph?
You code is producing the same results for all iteration. You can simply use a for loop, and use hold on to plot multiple plot...

2 months ago | 0

How to remove ticks of right y-axis when plot two y-axes figure using yyaxis
You can simply use yticks([]) after calling the yyaxis right. This simply remove all the ticks from the right y axis. x = linsp...

2 months ago | 1

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How to adjust x-axis in a plot?
You can use circshift to rotate your data in a circular fashion. Once you have the circular shifted data, you can just manipulat...

5 months ago | 1

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How to store matrices in a cell from a loop?
I am taking random data to show how you can store the output in a cell array using loop. for index=1:16 output{index}=rand...

6 months ago | 0

Deforming an image without changing axis scale
You can use axis square to force image to be square. See this below example. Let us load sample image: corn_gray = imread('cor...

6 months ago | 0

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Subplot with geobasemap and boxplot
You can do it easily using subplot. subplot(1,2,1) boxplot(randi(100,1,500)); subplot(1,2,2) tsunamis = readtable('tsunam...

6 months ago | 0

Data extraction from stacked plot

6 months ago | 0

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Access data from a cell array
Let us create a random data. random_data_cell=arrayfun(@(x) rand(138,18), 1:10, 'uni',0); Let merge these data set in a matrix...

6 months ago | 0

How to subtract symbol associated matrix columnwise
You cannot simply substract these two matrices, becasue B contains integers (double), and A has strings. You need to convert B ...

6 months ago | 0

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How to use the function uigetfile?
"How can I select the file from any folder on my computer?" This is pretty simple. You need to provide the full path of the fil...

6 months ago | 0

Removing data that exceeds y limit in a plot
x=linspace(0,3*pi,200); y=cos(x); plot(x,y) You can set range while calling the plot function. This is just an example. I am ...

6 months ago | 0

How to change the colour of the markers on a scattered graph?
I don't think I understood your question completely. Please do attach sample data (probably in a .mat file) and your complete co...

6 months ago | 0

Loop for renamed files from a folder
You can find the unique prefixes in the filename, and then use it to generate the string of numbers to rename the file. Here is ...

6 months ago | 0

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How to display an image in 3D cordinate axes ?
It is not really a 3D image. The third dimension has the RGB values. That is why you can able to see the color image. Let's see...

6 months ago | 0

Extract Digital Numbers from Image
You can simply use ocr command to do that. Refer to this documentation for some example, which would be a good starting point fo...

6 months ago | 0

How to create a netcdf in matlab which can be read by grads without using descriptor file?
There are often times when MATLAB created NetCDF files are not readable in earth and atmospheric science visualization softwares...

6 months ago | 2

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Submitted

nccreatewrite
Creates the NetCDF file directly, and these NetCDF files are readbale in GrADS. Get rid of writing the long commands everytime t...

How do I find the zero crossings for a function sinx/x against x?
Do you mean to find the x values which cooresponds to the zero in the y values? I do not think you have zero value in y variabl...

7 months ago | 0

How to calculate mean and standard deviation for loops?
You don't need to use loop for that. You can use cat command to concatenate, and then use mean and std functions to the matrix i...

7 months ago | 0

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How can I do this iteration?
Here is the sample code using random data a=rand(1,50); b=rand(1,50); threshold=0.5; % You need to change it to 1e-6 and use ...

7 months ago | 0

How to create a geographic colormap of the world using lat lon data?
You can simply use the contour or contourf or imagesc function to do that. Let us start with the random data. temp=randi(5,50,...

7 months ago | 1

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How can I produce equation from data set and optimize the equation
In order to produce equations for the datasets,, you can use fitnlm fucntion to do that. You will get an equation from that. Si...

7 months ago | 0

2D scatter-plot with colorbar
You can represent the no of measurements in bin as the fourth argument while calling the scatter plot. Here is the sample plot u...

7 months ago | 1

How to display subplot with multiple image with its own x and y axes ?
You need to make xaxis visible in every subplots. Here are the lines which you need to modify. title("Foreground before and aft...

7 months ago | 1

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How to find the point of highest concentration (plot)
There are multiple methods to select the center of the oval where density is maximum. One of the methods is just by counting the...

7 months ago | 0

How can I code a two variable function?
You can simply use for loop to iterate x and y. Refer to the below code just for your reference. You might need to make modifica...

7 months ago | 0

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Plotting multiple box plots on same graph with same size vector?
As you have not provided the exact data, I am generating just the random data. col=@(x)reshape(x,numel(x),1); boxplot2=@(C,var...

9 months ago | 0

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how can i select random 2*2 matrice of random number?
A=rand(randi(10,1,1),randi(10,1,1))

10 months ago | 0