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

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arvind ramasamy
arvind ramasamy 2017-11-29
评论： Jan 2017-11-30
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.

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回答（1 个）

Jan
Jan 2017-11-29
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.
  2 个评论
arvind ramasamy
arvind ramasamy 2017-11-29
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
Jan 2017-11-30
@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?

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