How to catenate string with variable and use this string as visa comand?

i add the value of c in string and than sendas visa command but it is not working i use two types of code below

c=1;
for i=0:10
c= 0.2+c;
u=fprintf('SOUR:VOLT %dV, (@2)',c);
fprintf(obj, 'u ');
end

also the in second try i use concatenation of string like given below

for i=1:4
%c= i+c;
s2 = 'SOUR:VOLT' ;
s1 = num2str(c);
s3 = 'V, (@2)';
s = strcat(s2,{' '},s1,s3);
fprintf(obj, 's' );
end

but instrument is not receiving proper command as is not giving output accordingly

[KSSV]

Question not clear...what is obj there? What exactly you want to do?

[Santhana Raj]

I hope you are using the fopen function after creating the visa object. Another thing to check is that the instrument communicates properly for the query for id('*IDN?'). This doesn't require any string concatenation. Hence if this also works, then it might be either your string problem or wrong command problem.

Coming to your question, better to do string concatenation in a simple way as

s=['SOUR:VOLT' num2str(i+c) 'V'];
fprintf(obj,s);

Hope it helps

[Muhammad Saad Naeem]

@Santhana Raj Thanks for help, it is done by your method

[Muhammad Saad Naeem]

@KSSV obj is visa object, i wanted to send command to U2722A via visa, but i was unable to send proper command by including C value

Answer 1

[Walter Roberson]

You have

u=fprintf('SOUR:VOLT %dV, (@2)',c);

you are trying to use an integer format, %d, for a non-integer value, which is changing by 0.1 at a time. You should use

u=fprintf('SOUR:VOLT %.1fV, (@2)',c);