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Johannes Deelstra


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Last seen: 7 månader ago Active since 2013

researcher
agriculture and environment
Professional Interests: agrohydrology

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Question


finding neighbouring locations in matrix bigger than a certain value
Hey I have a 324 x 1 matrix I like to find the neighbouring cells having each a value bigger than for example 50 Or how to I ...

mer än ett år ago | 1 answer | 0

1

answer

Question


readtable excel decimal NaN
I use readtable to get access to excel data some cells in the excell file contain no data and instead have a decimal point, h...

mer än ett år ago | 1 answer | 0

1

answer

Question


Unrecognized function or variable 'mean'.
just a very simple thing trying to calcualte a mean as for i = 1:31 b(i,:)=mean(a(24*i-23:24*i),:) end then i get this m...

ungefär 2 år ago | 0 answers | 0

0

answers

Answered
missing data, time series
Dear Peter, thanks very much for your answer and sorry for my late respons. The solution you propose is interesting, but can it ...

ungefär 3 år ago | 0

Question


missing data, time series
I am recording groundwater level at hourly intervalls using a data logger. I have data from 31 May 2017 09:00 hrs until 3 May 20...

ungefär 3 år ago | 3 answers | 0

3

answers

Question


Finding start of growing season
Hei, I have a time series with values of average daily temperatures for a period from 1 January 1943 - 31 December 2017. The d...

ungefär 3 år ago | 0 answers | 0

0

answers

Question


plotting, tools and fitting
Hei I plot two lines using plot(1961:2017,res(:,2)) hold on plot(1961:2017,res(:,4),'--') Then in figure clicking on Tool...

mer än 3 år ago | 1 answer | 0

1

answer

Question


extract numbers from time series
Have a time series from 1 to 156. Want to extract the values from 1:6, then from (1+12) : (6+12), etc into a new variable. How...

nästan 4 år ago | 2 answers | 0

2

answers

Question


information about the number of times temperature changes from negative to positive
Hello I have a time series with daily temperatures. The time series is starting with negative temperature. After some days th...

nästan 4 år ago | 2 answers | 0

2

answers

Question


how do obtain sum of two rows
Have a 18482 x 7 matrix. I want to obtain a matrix which contains the sum of row 1 and 2, row 3 and 4, etc until the last ones b...

mer än 4 år ago | 2 answers | 0

2

answers

Question


from cell to date
I have a cell variable 201624x1 with values for date from '01/01/1994 01' until '01/01/1994 01' How do I convert these into Ma...

nästan 5 år ago | 2 answers | 0

2

answers

Question


select a row from a matrix
Hei, How do I do the following task. I have a 90 x 12 matrix. From each three rows (1:3;4:6;7:9 etc.) I have to select one row...

mer än 5 år ago | 1 answer | 0

1

answer

Question


how to name a figure using a variable name
I have a figure and want to save this as a tiff or jpeg I have changed a date into variable = 'van190392 15' which I want to us...

ungefär 6 år ago | 1 answer | 0

1

answer

Question


<randum number generation
Hei, I have a time series for day and observation for a period of 365 days in variable a, a(:,1) being the daynumber (1 - 365) a...

ungefär 8 år ago | 2 answers | 0

2

answers

Question


slitting a number into year, mont and day
I have a column(a(:,1)) containing numbers like; 19900101 19900102 19900103 19900104 19900105 19...

ungefär 9 år ago | 2 answers | 0

2

answers