# Keegan Carvalho

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**Content Feed**

Learning to create climate data maps

There's a good number of resources. I use M_Map for all mapping pruposes in my projects and research work. Here's the link - h...

13 days ago | 2

Question

How to convert irregular daily data to annual data?

Hi All! I have a dataset (excel file attached - pcr.xlsx) of daily data values. The values are expressed as "Tonnes". I wanted ...

1 month ago | 1 answer | 0

### 1

answerQuestion

How to set map limits on mapshow?

Hi all! I currently plotted a shapefile (attached "Expot.shp") on to the world map. However, I wanted to shorten the limits. He...

3 months ago | 2 answers | 0

### 2

answersQuestion

How to fill polygons based on attribute values?

I have used the following code to load and plot the shapefile "Expot.shp" (attaced zip file). I wanted to plot the "Corr" attrib...

3 months ago | 1 answer | 0

### 1

answerTransform 2d array latitude into 1d array latitude

Is "tos" the SST variable? I don't see "sst" it in the figure. If "tos" is the SST variable, then 256 x 220 x 1032 would corre...

5 months ago | 0

Question

How to extract time series averaged over a region?

Hi All, I've been working on this monthly chlorophyll dataset where the "chl variable" has the dimensions 489x221x1X24 (lon x l...

5 months ago | 1 answer | 0

### 1

answerHow can I plot or place three or four figures in one figure

If I understood correctly, what you could do is use subplots. You could get your 4 images and then export them as one panel myi...

5 months ago | 0

How can i interpolate this data?

I'd assume "fillmissing" function would be best since you want to inteprolate the data row-wise (and this is not gridded interpo...

5 months ago | 1

Question

How to take monthly average from table?

Hi all! I have an excel file (attached) - data.xlsx. The first column "date" has values stored as "yyyymmdd" format for each gr...

5 months ago | 1 answer | 0

### 1

answerQuestion

How to get decade means of monthly 3D satellite data?

Hello Matlab World! I have been trying to convert the monthly netcdf data (file attached "bob") to decade data and later plot a...

2 years ago | 1 answer | 0

### 1

answerQuestion

How to regrid data based on longitude-latitude variables?

Hey Matlab world! I am trying to regrid the data (file attached "air") from a 2.5 by 2.5 grid to a 0.5 by 0.5 grid of a 3d matr...

2 years ago | 2 answers | 1

### 2

answersHow to use fitnlm

Firstly, you need to know what fitting curve you are looking for; linear, quadratic, etc. I've gone with polyfit which you can l...

2 years ago | 0

Converting mat files to daq format

I believe daq files are like integer, characters or signed integer files. So you can try converting your variable to an int32 as...

2 years ago | 0

Extract data of a irregular shaped region from global data set

You will have to try indexing. Assuming you have a 3-d gridded data file (netcdf, etc.): t % t is a variable (like temper...

2 years ago | 0

Question

How to take mean of rows of particular value?

I have an excel file with three columns (Year, Month, Temp). I wanted to find the monthly mean of Temp values from 1997 to 2019 ...

2 years ago | 1 answer | 0

### 1

answerQuestion

How to find significance of correlation coefficients?

Hi Matlab World, I am trying to find the significance of the correlation coefficients between two variables ssh and t (Zip file...

2 years ago | 1 answer | 0

### 1

answerQuestion

How to extract seasonal means?

Hey MATLAB universe! I have a file 360 x 40 x 444 (longitude x latitude x time). These are MONTHLY temperature values. The 444 ...

2 years ago | 2 answers | 0

### 2

answersQuestion

How to extract values from a 3-d .mat file?

Hi, I loaded a netcdf file and derived a .mat file which is a 3-D matrix of lon x lat x value (360 x 40 x 111). I wanted to ext...

2 years ago | 1 answer | 0

### 1

answerQuestion

How to find a particular value from 3-d matrix?

Hey MATLAB universe! I have a netcdf file of sea surface temperatures (360x40x444) and found the mean of it. I have obtained a ...

2 years ago | 2 answers | 0

### 2

answersShotest path between any two nodes in the graph

If I may, I have worked with ArcGIS and I don't think you can import .mxd files in Matlab. To the best of my knowledge, you can ...

3 years ago | 0

Question

How to fix black figure error?

I have attached a zipped netcdf file named 'trial'. I wanted to plot a variable 'sst' on the map; the data is downloaded for the...

3 years ago | 2 answers | 0

### 2

answersQuestion

How to adjust orientation of 2 maps?

I have attached the data file,'ssh.nc'. I used the following code to obtain regression coefficients between 'bottomT' and 'zos' ...

4 years ago | 1 answer | 0

### 1

answerQuestion

How to plot monthly averages on a map?

I have a netcdf file (attached zip file-'yl'). There is a temperature variable 'to' available from Jan-1993 to Jan-2017. Using n...

4 years ago | 1 answer | 0

### 1

answerQuestion

How to plot regression coefficients on a map?

I have attached a zipped netcdf file ('ssh.nc'). I wanted to do a corellation test between variables, 'zos' and 'bottomT' which ...

4 years ago | 1 answer | 0

### 1

answerQuestion

How to find the coefficient of determination (R2) between 2 variables in netcdf?

I have attached a zipped netcdf file ('ssh.nc'). I wanted to do a corellation test (OR to find the R2 value between two variab...

4 years ago | 1 answer | 0

### 1

answerQuestion

How to invert/flip only Y1 axis in a 2-line plot (Y1 and Y2 upon X)?

I am trying to a plot time series of two variables, ssh and iso (in csv file attached (ssh.csv)). However I wanted to invert/f...

4 years ago | 1 answer | 0

### 1

answerQuestion

How to extract variable data for given set of coordinates?

I'm currently working on Argo data. I used ncdisp to check the required variables and I need to extract Argo Temperature "TEMP" ...

4 years ago | 1 answer | 0

### 1

answerQuestion

Error in nonlinear regression

I am trying to make a nonlinear regression model of the attached csv file. I used the following code: if true data=readtab...

4 years ago | 3 answers | 0

### 3

answersQuestion

Error in non-linear regression

I am trying to prepare a non-linear reg model with the following variables in the following way: sea ~ sst + at I am receiv...

4 years ago | 1 answer | 0

### 1

answerQuestion

Non-linear regression

I have come across the documentations for regression but am a little confused. I wanted to obtain a non-linear regression model ...

4 years ago | 1 answer | 0