Smoothening the data of Iv loop

B = zeros(1,5);                         % Preallocate
C = zeros(1,5);                         % Preallocate
C = zeros(1,5);                         % Preallocate
for i=1:5
    B(i) = rand;
    C(i) = rand;
    D(i) = i;
end
time = D'
current = B'
data = table(time,current)

Also:

clear B C D

is inefficient and so not necessary. The variables will automatically be overwritten in the loop.

Note that the loop here is not at all necessary.

This does the same thing faster and more efficiently:

B = rand(1,5);
C = rand(1,5);
D = 1:5;

The rest of the code can also be made a bit more efficient.

To force the arrays to be column vectors, regardless of their original sizes, use the (:) subscript convention:

time = D(:);
current = B(:);
data = table(time,current)

With these changes, your code is now much more efficient!

Also, while I am thinking about it, what did you do to resolve the problems with the Keithley Nanovoltmeter? That information might be helpful to anyone else who sees this.

Somnath Kale 2020-12-2

编辑：Somnath Kale 2020-12-2

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@Star Strider

As always,. Thank you Very much! looking forward to receive such valueble info from you!!

I just have one dobut if the size of the matrix is not known prioly then? im collecting data from instrument so sometime its more than 10000 pts. if i have given extra large matrix size my data will be zero for empty cell. and then it will be problematic while plotting. this is also may be problamatic in plotting with live charts?(not clear to me)

Answer to your Question

I follwoed the following steps to connect my instrument with GPIB:

1) install drivers for GPIB

2) Establish the connection of instrument with computer first.(Ex. in case of NI GPIB-USB conertor check the connection using Ni Max app which will be atomatically installed while installing then drivers)

3) then install the Intrument control toolbox in your matlab

4) open intrument control toolbox and checked the connection again.

5) simply copy and paste the following code in your command window. (dont forget to change the Gpib Add. of intrumnt here my device have gpib add of 12)

To connect the Nanovolmater

% Find a GPIB object.
Voltmeter = instrfind('Type', 'gpib', 'BoardIndex', 0, 'PrimaryAddress', 12, 'Tag', '');
% Create the GPIB object if it does not exist otherwise use the object that was found.
if isempty(Voltmeter)
    Voltmeter = gpib('NI', 0, 12);
    Status2 = "Device not found"
else
    fclose(Voltmeter);
    Voltmeter = Voltmeter(1);
    Status2 = "Device connected"
end
% Connect to instrument object, Voltmeter
fopen(Voltmeter);
% Communicating with instrument object, Voltmeter
fprintf(Voltmeter, '*idn?');
ConnectedDevice2 = fscanf(Voltmeter)
fprintf(Voltmeter, '*rst');

6) this will do everything atomatically and reset your device if connection establish by the step 1 2 and 3 are fine

7) now your ready to communictae with your instrument. just enetr your acpi command in fprintf function.

I hope this will be really helpful even for beiginers !!

Star Strider 2020-12-2

Somnath Kale —

I very much appreciate your posting that information!

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