Johannes Deelstra

Last seen: 15日前 | 2013 年からアクティブ

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researcher agriculture and environment Professional Interests: agrohydrology

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質問

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...

約1年前 | 2 件の回答 | 0

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質問

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(...

約3年前 | 1 件の回答 | 0

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質問

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 ...

約5年前 | 1 件の回答 | 0

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質問

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...

約5年前 | 1 件の回答 | 0

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質問

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...

5年以上前 | 0 件の回答 | 0

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回答済み
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 ...

6年以上前 | 0

質問

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...

6年以上前 | 3 件の回答 | 0

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質問

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...

7年弱前 | 0 件の回答 | 0

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質問

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...

7年弱前 | 1 件の回答 | 0

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質問

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...

7年以上前 | 2 件の回答 | 0

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回答済み
information about the number of times temperature changes from negative to positive
thanks very much

7年以上前 | 0

質問

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...

7年以上前 | 2 件の回答 | 0

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質問

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...

約8年前 | 2 件の回答 | 0

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質問

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...

8年以上前 | 2 件の回答 | 0

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質問

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...

約9年前 | 1 件の回答 | 0

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質問

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...

9年以上前 | 1 件の回答 | 0

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質問

<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...

12年弱前 | 2 件の回答 | 0

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質問

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

12年以上前 | 2 件の回答 | 0

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