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ehsan


University of Vienna

Last seen: plus de 3 ans il y a |  Actif depuis 2015

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how to identify unique columns, based on the first two rows, make an average of the uniques columns and remove the duplicate columns?
I have a matrix with the size of 572 x 790. The first two rows of the matrixes are Longitude and Latitude for some stations, and...

plus de 5 ans il y a | 3 réponses | 0

3

réponses

Question


How to calculate monthly data from daily rainfall data in a time-seris 3-dimensional matrix?
I have a matrix with the size of 17 x 22 x 332. 17 stands for Latitude, 22 Longitude and 322 is days starts from Apr 1st, 2...

plus de 5 ans il y a | 1 réponse | 0

1

réponse

Question


how to replace Table_A withTable_B based on their corresponding date?
I have two tables, Table_A with 11322x281 dimension with NaN values, and Table_B with 322x281 with valus. The first, second an...

presque 6 ans il y a | 1 réponse | 0

1

réponse

Question


How to read multi three dimensions netcdf files in a loop and append their third dimensions?
Hello all, Assume I have 4 NetCDF file, each file has 4 variable: precipitation (size: 3600x1800x248), time (size: 248x1), l...

environ 6 ans il y a | 1 réponse | 0

1

réponse

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How to Sum each nth Pages of a Three Dimensional Matrix?
Hello all, I have a matrix with the size of 21x23x246. I would like to sum all arrays of the first, second, third ... and 8t...

environ 6 ans il y a | 1 réponse | 0

1

réponse

Question


How to read multi .txt files and extract files which are started with the specific name and write all these files in a new .txt file?
I have around 10000 .dat files. Their names are like this : tag-klima-500-1987-1_12.dat ; tag-klima-500-1987-1_12.dat ; tag-k...

environ 6 ans il y a | 1 réponse | 0

0

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Question


How to extract the values of two datasets from the same date/time from two table ?
Dear all. I have two big data sets with .mat format, each contains a table (an example of my data can be seen below). My rea...

plus de 6 ans il y a | 1 réponse | 0

1

réponse

Question


reshape and sum multi-dimensional matrix
Hi, I have a 20-by-30-by-40 matrix. I would like to sum each two page of the third dimension. In the end, I need to have a 20-...

plus de 6 ans il y a | 3 réponses | 0

3

réponses

Question


How to use spline interpolation for raster data with a specific condition?
Hi, I have a NetCDF file from satellite-based rainfall measurement (please look at attached file). Each grid is located in the c...

plus de 6 ans il y a | 1 réponse | 0

0

réponse

Question


How do I create a for loop for the this example?
Dear all, I have a code as follow: for i = 1:5 syms (['X_' , num2str(i)]) end J = (X_2 - X_1)^2 + (X_3 - X_2)...

presque 7 ans il y a | 1 réponse | 0

1

réponse

Question


how to sum symbolic equation
Dear all, I would like to sum a symbolic function as follow: J = sigma_j=1 ^J=5 (X{j+1} - X{j}) at the end It should ...

presque 7 ans il y a | 1 réponse | 0

1

réponse

Question


how to convert minute rainfall to daily rainfall with missing value?
Dear all, I have an excel file which contains many stations that measured rainfall for each 10 minutes. In the excel sheet, t...

environ 8 ans il y a | 1 réponse | 0

1

réponse

Question


How can I read many netcdf files with complex names by using loop in MATLAB?
Hello Guys, I would like to read many Netcdf files with this type of names: 3B-HHR.MS.MRG.3IMERG.20140401-S000000-E00295...

plus de 8 ans il y a | 1 réponse | 0

1

réponse

Question


How to separate positive and negative symbolic variables of an equation to the left and right sides of the equation in MATLAB?
for example we have this equation : 3*a - 2*b + 5*c - d = 0  First I need to separate positive and negative variables to bot...

presque 9 ans il y a | 1 réponse | 0

1

réponse

Réponse apportée
Derivatives of Cost Function for Minimizing
Thanks Torsten, Fortunately I found where was the problem. I didn't take into account the power of 2 (^2) in my equation for th...

presque 10 ans il y a | 0

Question


Derivatives of Cost Function for Minimizing
Hi, I have this Cost Function H = 1/(deltaX)^2 [(A2 - A1)^2 + (A3 - A2)^2 + (A4 - A3)^2] I'd like to minimize this cost funct...

presque 10 ans il y a | 2 réponses | 0

2

réponses