# Johannes Deelstra

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researcher

agriculture and environment

Professional Interests: agrohydrology

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**Content Feed**

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 ...

1 year ago | 1 answer | 0

### 1

answerQuestion

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...

1 year ago | 1 answer | 0

### 1

answerQuestion

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...

1 year ago | 0 answers | 0

### 0

answersmissing 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 ...

2 years 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...

2 years ago | 3 answers | 0

### 3

answersQuestion

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...

3 years ago | 0 answers | 0

### 0

answersQuestion

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...

3 years ago | 1 answer | 0

### 1

answerQuestion

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...

3 years ago | 2 answers | 0

### 2

answersinformation about the number of times temperature changes from negative to positive

thanks very much

3 years 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...

3 years ago | 2 answers | 0

### 2

answersQuestion

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...

4 years ago | 2 answers | 0

### 2

answersQuestion

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...

4 years ago | 2 answers | 0

### 2

answersQuestion

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...

5 years ago | 1 answer | 0

### 1

answerQuestion

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...

5 years ago | 1 answer | 0

### 1

answerQuestion

<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...

8 years ago | 2 answers | 0

### 2

answersQuestion

slitting a number into year, mont and day

I have a column(a(:,1)) containing numbers like; 19900101 19900102 19900103 19900104 19900105 19...

9 years ago | 2 answers | 0