# ANKUR KUMAR

### NASA IMPACT

Researching with NASA IMPACT |

MATLAB for fun | Python for research |

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**Content Feed**

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...

28 days ago | 1

| accepted

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...

2 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...

2 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...

2 months ago | 0

Data extraction from stacked plot

Let us load random data. tbl = readtable('patients.xls'); stackedplot(tbl,{'Height','Weight','Systolic','Diastolic'}) There m...

2 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...

2 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 ...

2 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...

2 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 ...

2 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...

2 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 ...

2 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...

2 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...

2 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...

2 months ago | 2

| accepted

Submitted

nccreatewrite

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

2 months ago | 5 downloads |

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...

2 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...

2 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 ...

2 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,...

2 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...

2 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...

2 months ago | 0

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...

2 months ago | 1

| accepted

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...

2 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...

2 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...

5 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))

6 months ago | 0

error using sum what can I change to fix it

mean(displacement(isnumeric(displacement)))

6 months ago | 0

How would I find the Eigen values and plot the Eigen vector onto my scatter plot

In order to find the eigen values, you need to have a matrix. You can plot eigen values of two matrix on a scatter plot. A=rand...

6 months ago | 0

How can I read in comma separated data from csv where some cells contain multiple numeric values that are also comma separated?

"there are 6 cells containing data in MouseX, and each contains 7 comma separated values. So I'd want a 6 x 7 numeric array.": T...

6 months ago | 0

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identity matrix nth order

n=20; eye(n) % identity matrix of order 20 eye(randi(50,1,1)) % identity matrix of a random order generated by randi

6 months ago | 0