# Plotting with a for loop

788 views (last 30 days)
Jayme on 1 Oct 2014
Answered: alaa sleem on 4 Jan 2022
I have a for loop and need to plot my final results. I have the hold on command in my code, but I still get only one point on my plot. What am I doing wrong?

Star Strider on 1 Oct 2014
You probably have the plot command inside your loop.
Guessing as to your code, but it is best to do something like this instead :
for k = 1:n
x(k) = k;
y(k) = sin(x(k));
end
figure(1)
plot(x, y)
Star Strider on 2 Oct 2014
SUCCESS!
You don’t need the loop:
T_i=25;
T_infinity=800;
h=20;
t=325;
rho=720;
k=.16;
c=1255;
alpha=k/(rho*c);
u=((h*sqrt(alpha*t))/k);
x=0:.001:.1;
v=((h*x)/k);
w=(x/(2*sqrt(alpha*t)));
v=((h*x)/k);
w=(x/(2*sqrt(alpha*t)));
T=(((erfc(w)-exp(v+u^2).*erfc(w+u))*(T_infinity-T_i))+T_i);
plot(x,T);shg
produces:

Esther Maria Ribezzo on 13 May 2020
I have the same problem!!
for i=1:length(asse_x);
MLSE=(norm(AI_concatenated-(S*(A_TOT(:,i))))).^2;
plot(asse_x(i),MLSE, '*')
hold on
end

Moh'd Allouzi on 13 Jun 2021
for k = 1:n
x(k) = k;
y(k) = sin(x(k));
end
figure(1)
plot(x, y)

alaa sleem on 4 Jan 2022
cp=1.2
ta=30
hhv=50000
tex=130
k=1
for lamda =(.8,.1,1.5)
A_F(k)=lamda*x*(32+3.76*28)/(n*12+m*1)
if lamda < 1
N_CO2= x*((2*lamda)-1)-(m/4);
n_CO= x*((2*lamda)-1)-(m/4);
n_h2o=m/2;
n_n2=(lamda*x*3.76);
Total=N_CO2+n_CO+n_n2+n_h2o;
Xi_co2(k)=N_CO2/Total;
Xi__CO(k)=n_CO/Total;
Xi_h2o(k)=n_h2o/Total;
Xi_N2(k)=n_n2/Total;
#______________________________________________lean_____________________________________________
else lamda >= 1
N_CO2= n;
n_O2= x*(lamda-1);
n_h2o=m/2;
n_n2=(lamda*x*3.76);
Total=N_CO2+n_O2+n_n2+n_h2o;
Xi_co2(k)=N_CO2/Total;
Xi_o2(k)=n_O2/Total;
Xi_h2o(k)=n_h2o/Total;
Xi_N2(k)=n_n2/Total;
end
t_f(k) = ta+(hhv/((1+lamda)*cp))
eta(k)= ((1+lamda)*cp*(t_f-tex))/hhv
lamd_list(k)=lamda
k=k+1
end
fig1 = figure(1);
ax1 = axes('Parent', fig1);
A_F_plot = plot(lamd_list, total_util);
%concentration
plot(lamd_list,Xi_co2)
hold.on
plot(lamd_list(:lenght(Xi_o2)),Xi_o2)
hold.on
plot(lamd_list(:lenght(Xi__CO)),Xi__CO)
hold.on
plot(lamd_list,Xi_h2o)
hold.on
plot(lamd_list,Xi_N2)
hold.off
%air fuel
plot(lamd_list,A_F)
%temp
plot(lamd_list,A_F)

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