Why does this split of the plot lines doesn't work?

x = linspace(0,8.7,1000)

a = zeros (1,1000)

b = zeros (1,1000)

c = zeros (1,1000)

d = zeros (1,1000)

hold on;

grid on;

%////////////////////////////////////////////////Fall 1///////////////////

figure(1);

for i = 1:1000

a(i) = 6.5*4000./((6.5-x(i)));
b(i) = 10500
c(i) = 6.5*9500./((x(i)));
d(i) = 500./(x(i)-6.5);

if a(i)<b(i)

plot(x,a,'.')

end

if d(i)<c(i)<b(i)

plot(x,c,'.')

end

if d(i)<c(i)

plot(x,d,'.')

end

plot(x,b,'.')

end

axis([0 10 0 12000])

Answer 1

[John BG]

the graph function is not the same as in grafik.png and the lower area needs some improvement, but would you consider the following a start point?

x=[1:1:100];y1=x([1:1:30]);y2=x(3)*ones(1,20);y3=x([30:-1:1]);y4=zeros(1,20);
y=[y1  y2 y3 y4];y=y+10;plot(x,y,'r')
patch('XData',x,'YData',y,'FaceColor','red','LineStyle','none')
axis([0 numel(x) 0 max(y)+5])
z=y-3;  % lift

delay=7
z([1:1:end-delay+1])=z([delay:1:end]) % advance
hold all
plot(x,z,'b')

Answer 2

[Walter Roberson]

if d(i)<c(i)<b(i)

means the same as

if ((d(i)<c(i))<b(i))

The calculation d(i)<c(i) returns back 0 (false) or 1 (true), and you then compare that 0 or 1 to b(i)

[Walter Roberson]

Fixing the if and adding some semi-colons produces a reasonable looking graph.

Answer 3

[John BG]

Herr Rüger

I am confident I can supply the correct answer, but i kindly ask for some clarification.

Dein script, with lines instead of dots, i have nur reduced the amount of points from 1000 down to 10:

x = linspace(0,8.7,10)
a = zeros (1,10)
b = zeros (1,10)
c = zeros (1,10)
d = zeros (1,10)

for i = 1:10
a(i) = 6.5*40./((6.5-x(i)));
b(i) = 105
c(i) = 6.5*95./((x(i)));
d(i) = 5./(x(i)-6.5);
if a(i)<b(i)
subplot(2,2,1);plot(x,a');axis([0 10 0 120]);grid on;hold all
end
if d(i)<c(i)<b(i)
figure(2);subplot(2,2,2);plot(x,c');axis([0 10 0 120]);grid on;hold all
end
if d(i)<c(i)
subplot(2,2,3);plot(x,d');axis([0 10 0 120]);grid on;hold all
end
subplot(2,2,4);plot(x,b');axis([0 10 0 120]);grid on;hold all
end

.

Aso, would you please define 'split' in the context of deine frage?

thanks for time and attention, awaiting comment

John BG

<mailto:[e-mail] [e-mail]>

Answer 4

[Fabian Rüeger]

Thank you for your answers. The final plot should look like this:->grafik.png

The diagramm describes a weight distribution of a lorry.

[John BG]

ok, so your question is not about splitting a plot, but how to add a shadow, to reproduce grafik.m in MATLAB, oder?