# Unrecognized function or variable

24 views (last 30 days)
Aijalon Marsh on 7 Mar 2022
Answered: Davide Masiello on 7 Mar 2022
So I have made a funtion and an m-file for calling that function but for some reason when I run the my m-file it says that the y is unrecognized below is my function and m-file please help me with this error:
Function:
function B2FrequencyResponse10(E, W, A)
K = 1;
t = (0:1.0:10)';
if (0 <= E) < 1
y = K*A-K*A*exp(-(e)*W*t)*(E/sqrt(1-E^2))*sin(W*sqrt(1-E^2)+cos(W*sqrt(1-E^2)));
if E == 1
y = K*A-K*A*(1+W*t)*exp(-(W)*t);
if E > 1
y = K*A-K*A*((E+sqrt(E^2-1))/2*sqrt(E^2-1)*exp(-(E)+sqrt(E^2-1)*W*t)+cos*(W*qrt(E^2-1)*t));
end
end
end
plot(t, y)
title('Step Response of Second-Order System')
xlabel('time')
ylabel('Output y(t)')
legend('E = 0')
end
m-file:
clear
E = 0;
W = 2;
A = 1;
hold on
B2FrequencyResponse10(E, W, A);

Torsten on 7 Mar 2022
function B2FrequencyResponse10(E, W, A)
K = 1;
t = (0:1.0:10)';
if E >= 0 & E < 1
y = K*A-K*A*exp(-(E)*W*t)*(E/sqrt(1-E^2))*sin(W*sqrt(1-E^2)+cos(W*sqrt(1-E^2)));
elseif E == 1
y = K*A-K*A*(1+W*t).*exp(-(W)*t);
elseif E > 1
y = K*A-K*A*((E+sqrt(E^2-1))/2*sqrt(E^2-1)*exp(-(E)+sqrt(E^2-1)*W*t)+cos*(W*sqrt(E^2-1)*t));
end
plot(t, y)
title('Step Response of Second-Order System')
xlabel('time')
ylabel('Output y(t)')
legend('E = 0')
end

Davide Masiello on 7 Mar 2022
clear,clc
E = 0;
W = 2;
A = 1;
t = (0:1.0:10)';
y = B2FrequencyResponse10(t,E,W,A);
plot(t,y)
title('Step Response of Second-Order System')
xlabel('time')
ylabel('Output y(t)')
legend('E = 0')
function y =B2FrequencyResponse10(t,E,W,A)
K = 1;
if E >= 0 && E < 1
y = K*A-K*A*exp(-(E)*W*t)*(E/sqrt(1-E^2))*sin(W*sqrt(1-E^2)+cos(W*sqrt(1-E^2)));
elseif E == 1
y = K*A-K*A*(1+W*t)*exp(-(W)*t);
else
y = K*A-K*A*((E+sqrt(E^2-1))/2*sqrt(E^2-1)*exp(-(E)+sqrt(E^2-1)*W*t)+cos*(W*qrt(E^2-1)*t));
end
end

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