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BenL


NTU

17 total contributions since 2013

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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...

1 year ago | 1 answer | 0

1

answer

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...

1 year ago | 1 answer | 0

1

answer

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...

1 year 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...

1 year ago | 1 answer | 0

1

answer

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 ...

1 year ago | 0 answers | 0

0

answers

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...

1 year ago | 1 answer | 0

1

answer

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...

1 year ago | 1 answer | 0

1

answer

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...

1 year ago | 1 answer | 0

1

answer

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...

1 year ago | 3 answers | 0

3

answers

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...

2 years ago | 1 answer | 0

1

answer

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...

2 years ago | 0 answers | 0

0

answers

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...

2 years ago | 1 answer | 0

1

answer

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 ...

2 years ago | 2 answers | 0

2

answers

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...

2 years ago | 2 answers | 0

2

answers

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...

2 years ago | 2 answers | 0

2

answers

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...

4 years ago | 0 answers | 0

0

answers

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...

5 years ago | 0 answers | 0

0

answers