I wish to know how to automatically draw a constant current , each time the program runs.

for example, Amp = [1,2,3,4,5]

fprintf(eLOAD_instr, 'curr %2f',Amp(0)) , I change Amp(1), Amp(2) each time program runs.

This is the #Setpoint I am giving to the instrument for me to do the calculations.

So how to make a script which automatically takes the next value from 'Amp' when I run it.

[Jan]

Amp(0)? Indices start at 1.

Answer 1

[Jan]

Define the variables:

Amp   = [1,2,3,4,5]
index = 0;

Now call this code:

index = index + 1;
fprintf(eLOAD_instr, 'curr %2f', Amp(index));

If you show us the context of your code lines, it might be possible to suggest a more precise solution, perhaps a persistent variable:

function yourCode
persistent index Amp
if isempty(index)
  index = 0;
  Amp = [1,2,3,4,5]
end

index = index + 1;
disp(Amp(index))
end

Now you can call this function repeatedly and index is incremented automatically - until you get an out-of-range error for index=6.

[arvind ramasamy]

Amp=1; while(exit) i=i+1; tic %reference = S(i);

    fprintf(eLOAD_instr, 'curr %2f',Amp)         % Setpoint to eLOAD
    pause(0.1)
    %%Get Data from ELR9000
    % Setpoint, Current, Voltage, Power
    Data_eLOAD_string           = query(eLOAD_instr, 'curr?; measure:current?; measure:voltage?; measure:power?');
    % Write Data_string in vector of type struct
    Data_eLOAD_string_vec{i}    = Data_eLOAD_string;
 toc
    while(toc < T_smpl)                % define Sampling time (0.1s)
         ;
    end
Set_pointStr = int2str(Amp) save ( ['Test_',Set_pointStr,'_Amp' '.mat'], 'U_eLOAD','I_eLOAD')

in this code now I want to run it for 5 times for different 'Current' so I manually change the value. So now I want to make it automatic

[Jan]

@arvind: Remember, that I do not have any idea about what you are doing. Which variable is the 'Current'? What about using a FOR loop?