When the condition RK1>RK2 becomes satisfied, the code breaks the for loop and returns the while loop, which is always satisfied as your condition is while 1. If you require your code to break from the for and while loops when the condition is satisfied, you can use the following:
function lanzar_2(name)
filename= strcat(num2str(name));
runCommand=strcat('abaqus job=',filename);
[runStatus,runCmdout]=dos(runCommand);
pause(20);
% Rk2=0;
var = 1;
while var
pause(5)
[Rk,XL41L400,F1]=Lecturas_abaqus(name) %Lectura del archivo STA
for i=2:length(F1)
RK2=F1(i,1);
RK1=F1(i-1);
if RK1>RK2
killCommand=strcat('abaqus job=',filename,32,'terminate');
[killStatus,killCmdout]=dos(killCommand);
var = 0;
break
end
end
end
end
