Graph figure wont show

clc;clear all;

l=25;
E=200e9;
I=350e-6;
w=6e3;

for x=linspace(0,l/2,25)
    y=(-(w*x)/(384*E*I))*(16*(x^3)-24*l*(x^2)+9*(l^3))
end

for x=linspace(l/2,l,26)
    y=(-(w*x)/(384*E*I))*(8*(x^3)-24*l*(x^2)+17*x*(l^2)-(l^3))
end
figure
plot(x,y)

Answer 1

[Image Analyst]

If you're absolutely required to use a for loop, just add an index to y

% Clean up
close all;
clc;
clear all;

l=25;
E=200e9;
I=350e-6;
w=6e3;
x1=linspace(0,l/2,25)
for k = 1 : length(x1)
    y1(k)=(-(w*x1(k))/(384*E*I))*(16*(x1(k)^3)-24*l*(x1(k)^2)+9*(l^3))
end

  x2=linspace(l/2,l,26)
for k = 1 : length(x2)
    y2(k)=(-(w*x2(k))/(384*E*I))*(8*(x2(k)^3)-24*l*(x2(k)^2)+17*x2(k)*(l^2)-(l^3))
end
x = [x1, x2];
y = [y1, y2];
plot(x,y, 'bo-')
grid on;

[ernest]

thank you so much! is it possible if i could get your contact for some other questions?

[Image Analyst]

I'm always here but I don't always have the best ideas so post here and get multiple good ideas you can choose from. You can't get that with a private side discussion with one person. Thanks for accepting though!

Answer 2

[Thorsten]

Because your y is just a single point. Work on the whole vector and make sure to use .*, ./ and .^ when you want point-wise operation.

l=25;E=200e9;I=350e-6;w=6e3;

x=linspace(0,l/2,25); y=(-(w*x)/(384*E*I)).*(16*(x.^3)-24*l*(x.^2)+9*(l^3)) ;
plot(x, y, 'b')
hold on
x=linspace(l/2,l,26); y=(-(w*x)/(384*E*I)).*(8*(x.^3)-24*l*(x.^2)+17*x*(l^2)-(l^3));
hold on
plot(x, y, 'r')

[ernest]

the question require me to use a loop operation,followed by an array operation. help please!