Error using * (line 334) Dimensions do not match., trying to multiply an array by a constant

%Internal virtual work intergrate with limits 0-L (M1)*M1v)/(E*I(x))
%Virtual load = atchual load
x = 0:0.17:L

Unrecognized function or variable 'L'.

I = ([b1*(H_o-((H_o-h_o)*x)/L).^3]/12)-([b2*(H_i-((H_o-h_o)*x)/L).^3]/12)

RA1 = (3/8)*w*L
RB1 = (w*L)-RA1

figure(3);
M1 = ((RA1*x)-(w*x.^2)/2)
plot(x,M1)

figure(4);
V = RA1-(w*x)
plot(x,V)

M1v = RA1v*x

figure(5);
Def = (M1*M1v)/(E.*I)
plot(x,Def)

Error using  *  (line 334)
Dimensions do not match.

Error in codeq1 (line 81)
Def = (M1*M1v)/(E.*I)

i am using this code to try and get the deflection of a point in beam with a varied cross section.

M1,M1v and I all vary with x and i have values for all the points along them buy seting x as 15 separate points between 0 and my beam length.

i am trying to plot 15 points of this equation Def = (M1*M1v)/(E.*I) but i get the error;

i assume its becasue E is a single number

anyone know what i can do to make this run and get the 15 values out

Answer 1

[Benjamin Thompson]

You have not posted code that defines all the variables. If E is supposed to be scalar, then replace ".*" with juts "*". If the I variable is not supposed to be scalar, use "./" instead of "/"and ensure the size of I is the same size as (M1*M1v).

Def = (M1*M1v)./(E*I)

[gwyn davies]

E is defiend as a single number i forgot to include in, even with the . there i am still geting the error