Question

How to convert cdf epoch to date and time?

I have a column of data which is in cdf epoch format. It contains date and time stamps Is there a simple way for me to convert a...

mer än 3 år ago | 1 answer | 0

Question

Regarding removal of low values within time series

I have a time series data (see attached data_qn.xls) that consists of values that are clearly lower than the rest of the observa...

mer än 3 år ago | 1 answer | 0

Answered

Regarding Continuous Wavelet Transform of signal to remove time-localized frequencies

Ok, I tried with R2017a and cwt() worked. I have another question though. I used this: cwt(data,hours(1),'morse'); % T...

Regarding Continuous Wavelet Transform of signal to remove time-localized frequencies

Ok, I tried with R2017a and cwt() worked. I have another question though. I used this: cwt(data,hours(1),'morse'); % T...

mer än 3 år ago | 0

Question

Regarding Continuous Wavelet Transform of signal to remove time-localized frequencies

Hi all. I have a strange issue when attempting to use the cwt() function on my array. I have tried this on R2012b and R2014b, bo...

mer än 3 år ago | 1 answer | 0

Question

Artificially improving the spectral power of a low frequency signal

First of all, I have to state upfront that I am not sure if this question is valid. Essentially, my question pertains to the ...

mer än 3 år ago | 0 answers | 0

Question

Trouble converting timestamp using date and date_vectors

1) I have 6 variables, ref_year,mth,day,hr,min,sec that corresponds to a reference time. I am having trouble getting MATLAB to r...

mer än 3 år ago | 1 answer | 0

Question

Extract value from a 3D array with interpolation

I have a 3D array with row (row_ID), column (col_ID) and Z (z_ID) identifiers. Essentially what I need is: # For a partic...

mer än 3 år ago | 1 answer | 0

Question

Store data into new variable based on condition

I have a n X 10 dataset (variable name = dataset, see attached file). Of interest are column 1 (variable name T) and column 6 (v...

mer än 3 år ago | 1 answer | 0

Question

Find length of intersection between 2 points and a sphere

I have a *sphere and 2 points*. The points have (x,y,z) coordinates and the sphere is defined by its centre (0,0,0) and radius R...

nästan 4 år ago | 3 answers | 0

Question

Calculating moving standard deviation (bounds) for time series

I have a *N* x 6 matrix and of interest are columns 1 and 5. Column 1 is time data in Excel's serial date format (e.g. 4.2644000...

nästan 4 år ago | 1 answer | 0

Question

Reading large data from Excel into MATLAB

I have about 30 .xlsx sheets, with n X 5 columns of data. Each sheet has n = 400,000 rows of data (approx.). I am currently read...

nästan 4 år ago | 0 answers | 0

Question

Calculating mean for time series

In matrix A, I have two columns: Col 1 = Time (in Excel serial date format e.g. 4.264400001156250e+04 = 01-Oct-2016 00:00:00...

nästan 4 år ago | 1 answer | 0

Question

Delete row based on criteria of 2 variables

In matrix A, I have n X 6 columns. In matrix B, I have n X 1 column. What I want to do is, if the element in column 6 of matrix ...

nästan 4 år ago | 2 answers | 0

Question

Combine date vector into single column

I have a n X 6 matrix, with time data: 1st col = yyyy (e.g. 2016) 2nd col = mm (e.g. 10 for Oct) 3rd col = day (e...

nästan 4 år ago | 2 answers | 0

Question

Combining and reading data from Excel (.xlsx) into Matlab

There are two parts of my query: 1) I have multiple .xlsx files stored in a folder, a total of 1 year's worth (~ 365 .xlsx fi...

nästan 4 år ago | 2 answers | 0

Question

Regarding Image Processing - nlfilter, blockproc, colfilt

Hi all, I'm currently running a script that requires a sliding window through an image. For each window, I have to compute the h...

ungefär 6 år ago | 0 answers | 0

Question

Point Cloud edge detection

Hi everyone, I have some images that are taken of a cylindrical sample which I require to model in order to obtain its volume...

mer än 7 år ago | 0 answers | 0