Can you please help me how to write this?

Hi Everyone,

I would like to have a matrix containing satellites tracked by receivers. So, the first Nsat(r) elements in the rth column correspond to the satellite tracked by the rth receiver.

Can you please help me how to write it?

Thank you,

[Ara]

I have attached three samples of my data. Example 1 should the output of my first function.

Answer 1

[Michael Haderlein]

From your three examples I see that the first two columns of amtab are:

>> c1=fix((0:numel(sat)-1)/(size(sat,1)))'+1;
>> am=[c1(sat(:)~=0),sat(sat(:)~=0)]

I cannot say anything about the third column as I don't understand its meaning.

Answer 2

[Michael Haderlein]

Your question is very difficult to understand as you give 0 details. So I'm just guessing you have some function which gives you the satellites of a specific receiver. Then it could read like

for cnt=1:length(receivers)
   temp_sat=getsatellites(receivers(cnt));
   sat(1:length(temp_sat),cnt)=temp_sat;
end

For your future questions, please follow this guideline (<http://www.mathworks.de/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer)>.

[Ara]

Thank you, Michael Haderlein. Yes, right on you. To be honest, this is the third time I edited my question, and yes I should have given more details.

I have some more questions so let me please provide you more details, and then ask my questions if you do not mind.

Actually, I am writing a function as follows,

function  amtab = Firstexample(sat, Nsat, Nrec) 

% Input:
% Nrec:Number of Receivers. Must be a scalar. 
% Nsat:Number of satellites. Vector of Nrecx1.
% sat: Number of PRNs tracked by receivers.

Nrec = 3;
Nsat = [4;4;4];
sat = [1 1 1;2 2 2;3 3 3;4 4 4];

% Output:
% The output named "amtab", where three receivers each tracked four
% satellites so the ambiguity based on S-basis theory 
% each satellite and receiver has to be presented exclusively by one of       the ambiguities in the 
% S-basis, with the exception of one ambiguity that represents both a
% receiver and a satellite. Then should be a matrix of 12x3.

Here "sat" is is a matrix containing satellites (e.g., PRNs) tracked by the receivers. The first "Nsat(r)" elements in the rth column correspond to the satellite PRNs tracked by the rth receiver.

The "output" is "ambtab" is a matrix of "Namb" ×3, where "Namb" is the number of ambiguities. Each row corresponds to a ambiguity with the first element (column) referring to the receiver, the second element (column) referring to the satellite PRN, and the third element (column) indicating whether the ambiguity belongs to S-basis (zero) or belongs to estimable set (one).

I am trying to write a function for this scenario.

It would be great if you give me some hints in order to solve it.

Thank you,

[Michael Haderlein]

I have no idea about this S-basis thing and I don't understand what you mean with ambiguity. Please provide an example which is clear even for people who don't work with satellites. Or, even better, check if the function "unique" and/or the related ones can help you.