Unrecognized function or variable 'P_v'. Solutions please!!!

%Datos base

clear all;
close all;

f1=50;
T1=1/f1;

td=0;%tiempo muerto

Modulation=0;%SPWM=0 CB-SPWM=1
control=0;%control =0: n y N aislados; control =1: n y N conectados

%%%%%%%%%%%%%%%%%%%%%%%
mf=21;%Para ver el efecto de los tiempos muertos poner un mf elevado (101) por ejemplo
ma=0.5;%Indice modulación en amplitud
Ts=1/(f1*mf);
Tsample=Ts/200;%para el step máximo de simulación

Vector_pico= (301:321:5); 

for i=1:length(Vector_pico) 
	Vpico=Vector_pico(i);
	sim('Actividad_6'); 
	P_vec(i)= P(end);
    Q_vec(i)= Q(end); 
    
end
%Representación
figure(1)
plot(Vector_pico, P_vec); 
tittle('Variacion de Potencia activa con diferente desfase');
xlabel ('Potencia activa');
ylabel ('desfase');

figure(1)
plot(Vector_pico, Q_vec); 
tittle('Variacion de Potencia reactiva con diferente desfase');
xlabel ('Potencia activa');
ylabel ('desfase');

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THIS IS THE ERROR!!!

Unrecognized function or variable 'P_vec'.

Error in actividad6 (line 31)

plot(Vector_pico, P_vec);

Answer 1

[Walter Roberson]

Vector_pico= (301:321:5); 

That is a vector that starts at 301, and has an increment of +321, and has an upper bound of 5 . Because the upper bound is less than the lower bound and the increment is positive, the vector is empty.

Vector_pico= (301:5:321); 

would be a vector that started at 301, had an increment of 5, and an upper bound of 321. It would have the values [301, 306, 311, 316, 321]