# How to write a variable in a Vector with a loop

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Zawar Salim on 27 Feb 2023
Commented: Zawar Salim on 27 Feb 2023
Hi MATLAB community
Im sitting here on a problem maybe i can get here some help. I have the feeling im close but i cant get it. I searched for countless websites....
I have a Instrument that writes its Reading in a Value rv1. rv1 is is from type num. I have a vector RVM=zeros (1,3). My Goal is to write a loop which writes the curent value of rv1 in every place of the vector
this is my code...
RVM=zeros(1,3)
for i2=1:length(RVM)
rv1=fscanf(DMM_Current2)
rv1= str2num(rv1);
i want RVM so show this [value rv1 first loop value, rv1 second loop, rv1 third loop .......]
sry if im asking a trivial question... im new to MATLAB and i couldnt find something usefull in the MATLAB handbook

Rik on 27 Feb 2023
If you have trouble with Matlab basics you may consider doing the Onramp tutorial (which is provided for free by Mathworks). See below for some advice and the line of code you likely needed.
for i2=1:numel(RVM) % use numel instead of length
fprintf(DMM_Current2,read_current); % why is this here?
rv1 = fscanf(DMM_Current2);
rv1 = str2double(rv1); % use str2double instead of str2num
RVM(i2) = rv1;
end
Zawar Salim on 27 Feb 2023
thx i will do that... im a student and i have actually passed a Moodule about Matlab basics. Im just Rusty because if was before corona XD. That code is part of a Project im doing.
for i2=1:numel(RVM) % thx
rv1 = fscanf(DMM_Current2); % this give the command to apply it.. so this and the command before are mandatory to get the right value from the intrument.
rv1 = str2double(rv1); % the , yes double is more precise
RVM(i2) = rv1;
end

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