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# Sagar

### The University of Texas at Austin

23 total contributions since 2014

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Fill data with NaN for missing days
I finally did it although using a loop: %create a index column first first_nan(:, 1) = 1:365; %compare the A matrix ...

3 years ago | 0

Question

Fill data with NaN for missing days
I have a matrix A in which I have number of days in first column and corresponding data in the second column. For example, A (...

3 years ago | 1 answer | 0

### 1

Question

Combine(mosaic) geolocated Earth data horizontally
Hi, I am processing MODIS level 2 data granules in hdf format. Reading one granule, I get one 203*135 sized 'latitude' matrix, a...

3 years ago | 0 answers | 0

### 0

Question

nanmean gives unexpected results
I am calculating nanmean using two different techniques. I have a matrix avg_terra_aqua1 of size 28*360000. In the first method,...

3 years ago | 1 answer | 0

### 1

Question

Using horzcat in a loop for combining large number of files
hi, I need to combine 100 matrices horizontally using horzcat. I have a matrix named 'data' of size 20*30*100 in which 100 repr...

3 years ago | 1 answer | 0

### 1

Question

indices when the columns are all nan
I am using [m, d] = nanmax (r_all); to get the maximum values and corresponding indices in matlab. There are several columns in ...

5 years ago | 2 answers | 0

### 2

Formula for cross-correlation in matlab
It looks like that 'xcorr' does not calculate Pearson correlation coefficient directly. To get Pearson correlation coefficient, ...

5 years ago | 0

| accepted

Question

Formula for cross-correlation in matlab
When we calculate cross correlation using the function 'xcorr' with 'coeff' option, does the function calculate Pearson correlat...

5 years ago | 2 answers | 0

### 2

Question

hide NaNs in geoshow
I am plotting some data using geoshow as below: geoshow (yy, xx, data, 'displaytype', 'texturemap'); The 'data' has a lot of NaN...

5 years ago | 2 answers | 0

### 2

Percentage of contribution of multiple factors to a single dependent variable using PCA in Matlab
Unfortunately, PCA may not be the tool for what you are looking for. PCA is more suitable when the number of variables is large ...

5 years ago | 0

Input for PCA function
Depending on your objective, you can probably consider 'd' as another variable. In such a case, put a, b, c, and d in four colum...

5 years ago | 0

PCA scaling and centering documentation wrong?
You got it little wrong. When you do PCA(Y), by default, PCA again centers the data. So if you want to get the same values as PC...

5 years ago | 0

Distinguish between 2 variables using PCA
PCA can certainly give some insights in your problem. Run PCA in your data and look at the different principal components. In yo...

5 years ago | 0

pca: missing first pc
Your question is not clear, pca(X) will give coefficient matrix whose first column represents coefficients of the first principa...

5 years ago | 0

| accepted

Interpreting outputs of pca function
In short, you cannot attribute one principal component to a particular variable, because by definition, a principal component is...

5 years ago | 0

Question

cross correlation using 'xcorr' in the presence of NaN or missing values
Hi I am trying to calculate cross correlation of two time-series at different lags but my data have a lot of NaN values. When I ...

5 years ago | 1 answer | 0

### 1

Question

using 'als' algorithm in pca
I am doing PCA using 'als' algorithm as below. When I specify a specific number of components (1 here), the 'explained' term giv...

6 years ago | 0 answers | 0

### 0

Question

nancov gives strange results
I have a standardized matrix (aod_normalized) of a variable whose size is 3653*12, where 3653 is the no. of observations and 12 ...

6 years ago | 1 answer | 0

### 1

plotting lat, lon, altitude, variable
Never mind! I was able to plot as I wanted with a small tweak. This is what I did: load ('coast.mat'); long (lo...

6 years ago | 0

Question

plotting lat, lon, altitude, variable
I have 3 vectors of latitude, longitude, and elevation respectively. I also have a corresponding 3d matrix of size latitude*long...

6 years ago | 4 answers | 0

### 4

Question

how to run a function in each cells?
Hi, I am using a function 'taylordiag' as follows: [ hp, ht, axl ] = taylordiag ( stn { 1 } (2, : ), stn { 1 } ( 3, : ), stn {...

6 years ago | 1 answer | 0

### 1

Question

How to calculate correlation coefficient between two 3-d matrices?
This is often required in analyzing climate data from netcdf files. Climate variables are stored in 3-d matrix (lat, lon, time)....

7 years ago | 2 answers | 0