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Richard


Active since 2011

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Question


re-build time series from pwelch after removing peaks in the spectra
I have time series data that is similar to the following: t = 3650; % number of days in ten years t = 1:t; % generate ti...

mer än 9 år ago | 1 answer | 0

1

answer

Question


find and store index for consecutive numbers
Consider the following: Jday = datenum('2009-01-01 00:00','yyyy-mm-dd HH:MM'):1:... datenum('2009-12-31 23:00','yyyy...

mer än 11 år ago | 1 answer | 0

1

answer

Question


add additional parameter to contour plot to generate 3d plot
I have an equation which has 3 unknown variables V, s, and T. I want to produce a contour plot that shows what happens when each...

nästan 12 år ago | 2 answers | 0

2

answers

Question


replace nan values with the mean of other cell array
Consider the following example: Jday = datenum('2007-01-01 00:00','yyyy-mm-dd HH:MM'):1:... datenum('2009-12-31 23:0...

nästan 12 år ago | 1 answer | 0

1

answer

Question


introduction to matlab I/O
I have some files that collect high resolution acoustic measurements and I wish to import some of the information into matlab wh...

nästan 12 år ago | 1 answer | 0

1

answer

Question


solving simple equations in matlab
I have 2 variables: d1 = 1:5; d2 = 6:10; I would like to calculate 'dat', which is given by: dat = d1./(10.*d2);...

nästan 12 år ago | 3 answers | 0

3

answers

Question


calculate week of year
I have an annual time series where measurements are recorded at hourly intervals: StartDate = '2011-01-01 00:00'; EndDat...

nästan 12 år ago | 2 answers | 0

2

answers

Question


short time fourier transform
I would like to perform a short time fourier transform (STFT) to a synthetic data series. I can compute the fourier transform by...

nästan 12 år ago | 3 answers | 0

3

answers

Question


plotting in time domain - update plot
I'm working through an example I saw online concerning vertical motion under gravity. The following code and plot shows the outc...

nästan 12 år ago | 1 answer | 0

1

answer

Answered
Why does the first value in loop get overwritten
Try Fi = [0,0.8:0.05:1]; T = 160; NPV_list = NaN(length(Fi),1); for fi = 1:length(Fi); F = Fi(fi); l...

nästan 12 år ago | 0

Question


difficulties with datetick and subplot dimensions
I have several time series that I am trying to analyse and I am plotting all the series in different subplots and scatter plots....

nästan 12 år ago | 0 answers | 0

0

answers

Answered
Hi, I'm trying to figure out why my script is only ploting the last input angle, not regarding any of the loops before it.
Try to put hold after the plot command: plot(x,y); hold on;

nästan 12 år ago | 0

Answered
how to omit the the dot and numbers
Not sure yet about cancelling the numbers, but you could omit the dots as follows: tt = {'a','0','.','c','1','.','c','3','....

ungefär 12 år ago | 1

Answered
Saving outputs in workspace
Maybe use assignin --> <http://www.mathworks.co.uk/help/matlab/ref/assignin.html>

ungefär 12 år ago | 1

| accepted

Question


replace missing values in a matrix
Consider the following: A = [1,1,1; 2,3,1; nan,3,1; nan,3,nan]; how would I replace the missing val...

ungefär 12 år ago | 2 answers | 0

2

answers

Question


find number of columns on text file
Is it possible to determine the number of columns in a text file prior to importing the data into matlab? I can determine the...

ungefär 12 år ago | 1 answer | 0

1

answer

Answered
no degree symbol
I dont know if this will help but I use ^{o} so for temperature in degrees C I type xlabel('Temperature ^{o}C');

ungefär 12 år ago | 9

Question


removing a loop from a script
I have a matrix 'd' which represents air temperature at specific heights above the ground and for different days of the year. Ea...

ungefär 12 år ago | 1 answer | 0

1

answer

Question


replacing nan values with the mean of a moving window
From the following: t = transpose(1/24:1/24:40); data1 = 1+(30-1).*rand(length(t),1); Randm = floor(1+(length(t)-1).*...

ungefär 12 år ago | 1 answer | 0

1

answer

Question


extracting values at set intervals from a vector
From the following vector: depth = [0:0.1:20]; How could I create a new vector that had the same data as 'depth' but a v...

ungefär 12 år ago | 1 answer | 0

1

answer

Question


explanation for script containing while loop
I was given a script for reading data from a specific file, and although the script works, I don't understand one section of it,...

ungefär 12 år ago | 1 answer | 0

1

answer

Question


gain information from a .cnv file
I have some data stored in a .cnv file, the data is stored as follows: # <!-- Pressure voltage, Pressure, Strain Gauge ...

ungefär 12 år ago | 1 answer | 0

1

answer

Question


re-formatting a matrix
This is a simplistic example of a problem I am facing: depth = [0:1:20]'; data = rand(1,length(depth))'; d = [dep...

ungefär 12 år ago | 2 answers | 0

2

answers

Question


insert an array according to the values from another variable
From the following example: time = [733774,733774,733775,733775,733775,733776,733776]; bthD = [20,10,0,15,10,20,10]; ...

ungefär 12 år ago | 1 answer | 0

1

answer

Question


find values from a matrix according to a criterion
I have a time series of measurements as follows: time = [733774,733774,733775,733775,733775,733776,733776]; data = [1,1....

ungefär 12 år ago | 2 answers | 0

2

answers

Question


plotting data from two years with day of year replacing julian date
I have the following code for producing a plot of data that extends two years in terms of day of year: time = datenum('2008...

ungefär 12 år ago | 2 answers | 0

2

answers

Question


Method for aligning tick labels
Is there a method of aligning tick labels? I have a figure that has two y axis where the values vary greatly. I would like to al...

ungefär 12 år ago | 1 answer | 0

1

answer

Question


different limits for 2 yaxis
I'm generating a plot with 2 yaxis showing two datasets with larger differences in their values, e.g. data1 = 100 + (200-10...

ungefär 12 år ago | 2 answers | 0

2

answers

Question


white contour on top of grayscale image
Is there a method for changing the colorscale of your figure to grayscale without using the colormap('gray') option. I have an i...

ungefär 12 år ago | 2 answers | 0

2

answers

Question


on the use of the accumarray function
Could someone please explain to me how the accumarray function works. For example: val = 101:105; subs = [1; 2; 4; 2; 4]...

ungefär 12 år ago | 2 answers | 2

2

answers

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