fill in the area in plot

Question

Alina Abdikadyr on 17 Feb 2023

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https://uk.mathworks.com/matlabcentral/answers/1914670-fill-in-the-area-in-plot

Answered: Star Strider on 19 Feb 2023

Accepted Answer: Star Strider

Open in MATLAB Online

How can I fill in the area

My code is

%3.2
clear all
W=45000;
S=9;
b=7.5;
clmax=2;
clmin=-1;
nmax=4;
AR=7;
nmin=-3;
clalpha = 2*pi;
Vdive=290; 
Vstall=sqrt(2*W/(1.225*S*clmax));
cd0 = 0.005;
k = 1/pi/AR;
n1v = 0:0.25:4;
i=0;
for n1 = 0:0.25:4
        i=i+1;
        V(i) = sqrt(2*n1*W/1.225/S/clmax);
        nmaxx(i)=nmax;
        nminn(i)=nmin;
end
j=0;
n2v = -3:0.25:0;
for n2 = -3:0.25:0
        j=j+1;
        V2(j) = sqrt(2*n2*W/1.225/S/clmin);
        nmaxx(j)=nmax;
        nminn(j)=nmin;
end
k=0;
nv=-3:0.25:4;
for n=-3:0.25:4
k=k+1;
Vmax(k)=Vdive;
end
m=0;
n3v=-3:0.25:4;
for n3=-3:0.25:4
m=m+1;
Vstall1(m)=Vstall;
end
figure(5); plot(V,n1v, 'DisplayName','n1v')
hold on 
plot([V Vmax(end)],[nmaxx nmaxx(end)], 'DisplayName','nmaxx')
hold on 
plot([V Vmax(end)],[nminn nminn(end)], 'DisplayName','nminn')
hold on 
plot(V2,n2v, 'DisplayName','n2v');
plot(Vmax,nv, 'DisplayName','nv');
hold on 
plot(Vstall1,n3v, 'DisplayName','n3v');
xlim([-1 325]);
ylim([-4 5]);

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Answer 1

Star Strider on 19 Feb 2023

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https://uk.mathworks.com/matlabcentral/answers/1914670-fill-in-the-area-in-plot#answer_1174960

Open in MATLAB Online

Please see my Comment to your previous post.

I do not know what parts you want to fill, so again, I filled each of them.

Choose the appropriate patch calls —

%3.2

clear all

W=45000;

S=9;

b=7.5;

clmax=2;

clmin=-1;

nmax=4;

AR=7;

nmin=-3;

clalpha = 2*pi;

Vdive=290;

Vstall=sqrt(2*W/(1.225*S*clmax));

cd0 = 0.005;

k = 1/pi/AR;

n1v = 0:0.25:4;

i=0;

for n1 = 0:0.25:4

i=i+1;

V(i) = sqrt(2*n1*W/1.225/S/clmax);

nmaxx(i)=nmax;

nminn(i)=nmin;

end

j=0;

n2v = -3:0.25:0;

for n2 = -3:0.25:0

j=j+1;

V2(j) = sqrt(2*n2*W/1.225/S/clmin);

nmaxx(j)=nmax;

nminn(j)=nmin;

end

k=0;

nv=-3:0.25:4;

for n=-3:0.25:4

k=k+1;

Vmax(k)=Vdive;

end

m=0;

n3v=-3:0.25:4;

for n3=-3:0.25:4

m=m+1;

Vstall1(m)=Vstall;

end

figure(5); plot(V,n1v, 'DisplayName','n1v')

hold on

plot([V Vmax(end)],[nmaxx nmaxx(end)], 'DisplayName','nmaxx')

hold on

plot([V Vmax(end)],[nminn nminn(end)], 'DisplayName','nminn')

hold on

plot(V2,n2v, 'DisplayName','n2v');

plot(Vmax,nv, 'DisplayName','nv');

hold on

plot(Vstall1,n3v, 'DisplayName','n3v');

xlim([-1 325]);

ylim([-4 5]);

patch([Vmax(end) V2 flip(V2) Vmax(end)], [zeros(size([n2v n2v(1)])) flip(n2v) n2v(1)], 'm', 'FaceAlpha',0.25)

patch([V Vmax(end) Vmax(end) flip(V)], [zeros(size([n1v n1v(end)])) n1v(end) flip(n1v)], 'm', 'FaceAlpha',0.25)

LvVs1 = V<=Vstall; % Logical Vector: Region 4

LvVs2 = V>=Vstall; % Logical Vector: Region 1

LvV2s1 = V2<=Vstall; % Logical Vector: Region 3

LvV2s2 = V2>=Vstall; % Logical Vector: Region 2

patch([V2(LvV2s1) flip(V2(LvV2s1))], [ones(size(n2v(LvV2s1)))*min(n2v) flip(n2v(LvV2s1))], [0.1 0.8 0.3], 'FaceAlpha',0.25) % Region 4

patch([V(LvVs1) flip(V(LvVs1))], [n1v(LvVs1) ones(size(n1v(LvVs1)))*max(n1v)], [0.5 0.2 0.5], 'FaceAlpha',0.25) % Region 1

patch([V2(LvV2s2) flip(V2(LvV2s2))], [ones(size(n2v(LvV2s2)))*min(n2v) flip(n2v(LvV2s2))], [0.3 0.5 0.8], 'FaceAlpha',0.25) % Region 3

patch([V(LvVs2) flip(V(LvVs2))], [n1v(LvVs2) ones(size(n1v(LvVs2)))*max(n1v)], [0.8 0.4 0.2], 'FaceAlpha',0.25) % Region 2

text([25 75 75 25], [3 3 -2 -2], compose('%d',1:4))

I keyed the patch calls and the logical vectors to the appropriate regions in the in-line comments for each of them. Choose the ones you want to fill, and change the colours as necessary.

.