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Johannes Deelstra


Last seen: 18 dagen ago |  Active since 2013

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researcher agriculture and environment Professional Interests: agrohydrology

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finding relation between two variables, being discharge and water level in a river
I have to variables, being a water level (h) and a discharge (q). The relation is to be of the form q = h^c How do I solve th...

28 dagen ago | 2 answers | 0

2

answers

Question


how do i join 2 matrices
I have 2 matrices a and b, both having size 5 x 5 I want to combine these 2 in a new matrix c, such that c = [a(:,1) b(:,1) a(...

ongeveer 2 jaar ago | 1 answer | 0

1

answer

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 ...

ongeveer 4 jaar 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...

ongeveer 4 jaar 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...

meer dan 4 jaar ago | 0 answers | 0

0

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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 ...

meer dan 5 jaar 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...

meer dan 5 jaar 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...

meer dan 5 jaar 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...

bijna 6 jaar 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...

meer dan 6 jaar ago | 2 answers | 0

2

answers

Answered
information about the number of times temperature changes from negative to positive
thanks very much

meer dan 6 jaar ago | 0

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...

meer dan 6 jaar 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...

bijna 7 jaar 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...

meer dan 7 jaar 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...

ongeveer 8 jaar 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...

meer dan 8 jaar 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...

meer dan 10 jaar 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...

meer dan 11 jaar ago | 2 answers | 0

2

answers