提问

create cell array of individual years from a long time series
I have a matrix which is composed of a mixture of datevec and time series of measurements, e.g. time = datevec(datenum('196...

12 years 前 | 1 个回答 | 0

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提问

save figure in a certain size
In the following figure: data = rand(1,365); subplot(121); plot(1:365,data); xlabel('label'); ylabel('label'); ...

12 years 前 | 3 个回答 | 0

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plotting data extending one year
In the following example I have a data set that extends over a section of two years. time = datenum('2008-04-17 02:00'):dat...

12 years 前 | 1 个回答 | 0

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calculating hourly means of a matrix
I have a dataset in the following format: dd = datenum('2009-04-17 02:00'); ddend = datenum('2009-11-24 12:27');...

12 years 前 | 2 个回答 | 0

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提问

same y label on both sides of contourf
From the following example: [C,h] = contourf(peaks(20),10); colormap autumn How would I include the yaxis on the left...

12 years 前 | 2 个回答 | 0

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adding vector entry after each element
This is a very basic question but how would I add the elements of a vector like so...: x = [1,2,3,4,5,6]; ans = 3 6 10 15 ...

12 years 前 | 2 个回答 | 0

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提问

find the row number of values greater than...
I would like to find in which column a desired number is first located. From the example below: x = [0,1,3,2,5,22,24,1,2,...

12 years 前 | 2 个回答 | 0

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interpolating over vectors and matrices
Consider the following example: time = 1/24:1/24:365; period = 0:0.0232:1.964; power = 0 + (1-0)*rand(85,8760); pc...

12 years 前 | 1 个回答 | 0

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提问

evaluate the variation in the power of a known periodicity
Consider the following example: t = 1/24:1/24:365; x = cos((2*pi)/12*t)+randn(size(t)); % if you have the signal proc...

12 years 前 | 1 个回答 | 0

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analyse specific frequencies in a time series
I have a long data set of water temperature: t = 1/24:1/24:365; y = 1 + (30-1).*rand(1,length(t)); plot(t,y) The s...

12 years 前 | 1 个回答 | 0

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spectral coherence between several time series
I need some advice regarding the spectral coherence of several signals. Consider the following example: t = 1:365; A =...

12 years 前 | 2 个回答 | 0

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get children of a figure
I have a code below that highlights a defined region in a plot: x = 1:24; a = 1; b = 50; y = a + (b-1).*rand(lengt...

12 years 前 | 2 个回答 | 0

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提问

calculate the correlation of a number of time series
If I have a matrix: data = rand(365,5); What is the most appropriate way of calculating the correlation between each col...

12 years 前 | 3 个回答 | 0

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提问

calculate mean value for each hour of the day from a time series
I would like to calculate the hourly mean values for the following time series: DateTime = datestr(datenum('2011-01-01 00:0...

12 years 前 | 1 个回答 | 0

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提问

solid contour lines for some specific values of a contourf plot
After generating a contourf plot is it possible to draw a solid black line around some specific values? For example: [C,...

12 years 前 | 1 个回答 | 0

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calculate monthly averages of time series
I have a dataset which contains measurements taken at discrete intervals for the past ~ 40 years. I would like to calculate the ...

12 years 前 | 1 个回答 | 0

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subplot within a subplot
Is there a method for generating a subplot within a subplot? For example: time = 1:168; RawData = cos((2*pi)/12*time)+ra...

12 years 前 | 2 个回答 | 0

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提问

literature associated with the periodogram function
I have recently created a periodogram for some data: <http://www.mathworks.co.uk/matlabcentral/answers/42241-spectral-analysi...

12 years 前 | 1 个回答 | 0

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spectral analysis for time series data
I am attempting to analyse a time series with spectral analysis and am working through the example shown in: <http://www.math...

12 years 前 | 2 个回答 | 0

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提问

generate time series
I would like to generate a time series for one year of hourly values, so for 2011 ti would 8760 values within the series. To mak...

12 years 前 | 1 个回答 | 0

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已回答
Calculate difference between two times
Its hard to suggest what you can do from your example. I would suggest converting any dates into julian dates when working in ma...

12 years 前 | 0

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A simple question
If you have 60 rows and 3 columns in matrix 'a' then you can find the mean of each row i.e. the first three values as you stated...

12 years 前 | 0

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How to read the text files sequentially?
The main problem you have here is that you have not stored each of the text file names. The code shown below should solve thi...

12 years 前 | 1

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提问

use of horzcat
What is the use of horzcat? Is there an advantage of using horzcat over manually concatenating arrays horizontally? for example:...

12 years 前 | 1 个回答 | 0

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How do use fopen properly. Everytime I try I recieve an error.
Its hard to say without an example, which I realise is not easy in this case. I suggest to start with the help page. <http://...

12 years 前 | 0

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Save a histogram in a folder and plot it later .
I dont know if this answers your question but you could save then as a .fig file! <http://www.mathworks.co.uk/help/techdoc/cr...

12 years 前 | 0

提问

omitting pointers when listing folder contents
In order to list folder contents I use: TopFolder = dir('E:\'); Say if I had one file within that specific folder MATLAB...

12 years 前 | 2 个回答 | 0

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How to plot data after being selected in Excel
what command are you using to import the data from Excel? Cant you just import them into your workspace and then specify the var...

12 years 前 | 0

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已回答
Large structures won't save
I doubt that MATLAB is out of memory. You are probable just saving the data incorrectly. Look at <http://www.mathworks.com/m...

12 years 前 | 0

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simple question
using ChangesN = find(diff(S)) would demonstrate where the value was changing and then to see how many time this happen...

12 years 前 | 1

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