Community Profile

# Sagar

### The University of Texas at Austin

23 2014 年以降の合計貢献数

#### Sagar's バッジ

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年以上 前 | 0

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年以上 前 | 1 件の回答 | 0

### 1

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年以上 前 | 0 件の回答 | 0

### 0

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年以上 前 | 1 件の回答 | 0

### 1

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年以上 前 | 1 件の回答 | 0

### 1

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 ...

### 2

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

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

### 2

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年以上 前 | 2 件の回答 | 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年以上 前 | 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年以上 前 | 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年以上 前 | 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年以上 前 | 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年以上 前 | 0

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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年以上 前 | 0

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年以上 前 | 1 件の回答 | 0

### 1

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年弱 前 | 0 件の回答 | 0

### 0

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年弱 前 | 1 件の回答 | 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...

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...

### 4

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年以上 前 | 1 件の回答 | 0

### 1

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年弱 前 | 2 件の回答 | 0

### 2

How to rotate entire 3d data with x,y,z values along a particular axis (say x axis)?
I need to rotate my 3d dataset defined by x,y,z coordinate along x axis at a specified angle (say 45 degree). This kinds of rota...