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Artem Smirnov


Last seen: 1 year ago |  Active since 2016

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Question


Problem recovering the filtered signal using IFFT
Hello! I have geomagnetic field values, 1 value each month, for several years. What I want to do with the data is to erase yearl...

5 years ago | 1 answer | 0

1

answer

Question


How can I save ALL workspace variables?
Hello! I have 7104 .mat files, each of them has different variables inside. I was asked to transfer these matlab files to .cdf o...

6 years ago | 3 answers | 0

3

answers

Question


Something is wrong in the Fourier transform...
Hello! I have data, which are time-series of the magnetic field. It consists of 365 values per year for 8 years. I need to calc...

6 years ago | 2 answers | 0

2

answers

Question


XCORR of two harmonic signals has a triangular shape. Why?
Hello! I have two signals (H and Z), which are almost harmonic. Both vectors contain 4018 elements each (I attach the picture)....

6 years ago | 1 answer | 0

1

answer

Question


XCORR returns NaNs on interpolated data
Hello! I have a vector A of dimension 12*1 with monthly values of temperature, and a vector B of dimension 365*1 with daily val...

6 years ago | 1 answer | 0

1

answer

Question


How to compute Fourier transform of a signal?
Hello! I have three arrays of data (see the picture). There is 1 measurement every day for 11 years. I know that for fft I need...

6 years ago | 1 answer | 0

1

answer

Question


Why is not cross-correlation symmetric with respect to zero?
Hello! </p> I need to create a harmonic signal, then to add some noise and to calculate auto cross-correlation. I know that au...

6 years ago | 1 answer | 0

1

answer

Question


How to read data from txt between 2 lines with the same symbol?
* Hello! * I have a lot of .txt files (<1000 lines each). The data format is the following (the picture): there are some line...

6 years ago | 1 answer | 0

1

answer

Question


How to find files with specified filenames within a folder?
Hello. My problem is the following. I have downloaded tons of data from Intermagnet (I'm conducting research connected with mag...

7 years ago | 1 answer | 0

1

answer

Answered
how to close an excel file
Try this: close all

7 years ago | 0

Question


Why do subplots created in a loop disappear on a new iteration?
Hello. I am doing research for my thesis, which I have almost completed, except for one thing. I have to create a big spreadshee...

7 years ago | 1 answer | 0

1

answer

Answered
plot X as a function of Y
If you want to create a plot you have to write plot(y,x). What do you mean saying you want to create a 3d-plot AS a function of...

7 years ago | 0

Question


How to create several subplots without tick labels in a loop?
I have got the following problem. I have several subplots within one figure, that are created in a loop. I want to get rid of th...

7 years ago | 1 answer | 1

1

answer

Question


A problem with a matrix
Hello. I am doing research connected with magnetic observatory data. I have 50 observatories and each of them produces 12 dire...

7 years ago | 1 answer | 0

1

answer