Community Profile # peter huang

Last seen: 3 mesi ago Active since 2021

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when datenum is the x-axis How to change the x-axis to discernable time
I have a five-year water level data. On the x-axis, I use datenum to convert the time into numbers so that I can draw the graph,...

3 mesi ago | 1 answer | 0

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Question

how to use rose diagram appear wind direction and wind speed
i have wind data (direction and speed) but i can not know matlab polarhistogram code mean How can I render a rose diagram with...

3 mesi ago | 0 answers | 0

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How to judge the duplicate value of the previous loop and the current loop in the loop
a = [201101 201107 201201 201207 201301 201307 201401 201407 201501 201507] for k = 1:2 if k =mod(k,2)==1 index =(1:5) y...

4 mesi ago | 1 answer | 0

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matlab set loop conditons question
When multiple conditions are set in the loop, when encountering an item that satisfies the repeated conditions, how to determine...

4 mesi ago | 1 answer | 0

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fft question about data length and spline data
I want use fft analizy my water level data. because my data have lost ,so i use spline fill up my data. but when i use data le...

4 mesi ago | 1 answer | 0

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Question

how to distinguish fft frequency is real existence or noise
i useing fft analyze tide water level i want find exist tide component but fft present a lot of noise i want distinguish fr...

4 mesi ago | 1 answer | 0

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datenum using lunar calendar question
i want using lunar calendar in matlab and want plot my tide data and using lunar calendar be my timeseries but lunar calenda...

4 mesi ago | 0 answers | 0

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How to add hours to the time data of one day
i have raw data timeseries (excel column A) i want use marlab add hours to the time data (like column B) how to addtion hours...

4 mesi ago | 2 answers | 0

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matlab have lunar calendar code?
i have vids time series i want convert timeseries to lunar calendar (traditional Chinese calendar) matlab have code convert ?...

4 mesi ago | 0 answers | 0

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How to remove noise from the signal analyzed by fft
i analyzed tide signal want find to the actual frequency but fft product many noise i want remove it matlab have which co...

4 mesi ago | 1 answer | 0

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Question

how to adjust x-axis in plot
i want x-axis to be 30 is starting point 30 2 4 6 8 10 .... 30 2 4 6 8 10 .... 30 2 ..... like a once a month loop

5 mesi ago | 2 answers | 0

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Question

I have a problem with drawing on the timeline
clear all ; clc ; clf ; set(gcf,'color','w') %% load data filehtm = dir('moving_windown_test.xlsx') ; for...

6 mesi ago | 0 answers | 0

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Question

How to remove leap year dates from time series in data
How to remove leap year(2/29) dates from time series in data (My time series is hour by hour)

7 mesi ago | 1 answer | 0

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Question

How to extract all the data for a fixed year
How to extract all the data for a fixed year and write a loop to get the annual data 1961, 1962...

7 mesi ago | 1 answer | 0

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I have matlab problem removing outliers
I want to remove outliers by year, but the values are same every year. And my plot. My code: clear all ; clc ; clf ; set(gcf...

7 mesi ago | 1 answer | 0

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Question

i have loop problem
i have 5 year of data with water level and time i want to remove outlines for each year here is how i remove outlines : i wou...

7 mesi ago | 1 answer | 0

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prctile how to calculate
@Star Strider thanks i solve my problem successfully

7 mesi ago | 0

Question

prctile how to calculate
first of all , my english is not very good if there are many grammatical errors , please include it . hi, i don,t know about ...

8 mesi ago | 2 answers | 0