The value of equation

syms x u x3
%x = (0:1:4)
L1 = 8;
L = L1
h1 = 0.1*L

W1 = 17;
f(x)=(4*h1*x/L1)-((4*h1*(x^2))/L1^2);
m1 = diff(f(x));
RAh = 3*W1*L1/8;
RBh = W1*L1/8
HAh = (W1*L1^2)/(16*h1)
HBh = HAh;
H_riser = HAh
VAh = RAh
VBh = RBh

%x = (0:1:L/2);
SFnhac = VAh-W1*x
u1 = m1

Answer 1

[Star Strider]

I have absolutely no clue as to what you want.

Try this —

syms x u x3
%x = (0:1:4)
L1 = 8;
L = L1

L = 8

h1 = 0.1*L

h1 = 0.8000

W1 = 17;
f(x)=(4*h1*x/L1)-((4*h1*(x^2))/L1^2);
m1 = diff(f(x));
RAh = 3*W1*L1/8;
RBh = W1*L1/8

RBh = 17

HAh = (W1*L1^2)/(16*h1)

HAh = 85

HBh = HAh;
H_riser = HAh

H_riser = 85

VAh = RAh

VAh = 51

VBh = RBh

VBh = 17

%x = (0:1:L/2);
SFnhac = VAh-W1*x

SFnhac = 

u1 = m1

u1 = 

solve_u1_for_x = solve(u1)

solve_u1_for_x = 

4

.

[Mohamed Magid]

for x = (0:1:4) I can get the value of u1 and I get this massage

Error using sym.getEqnsVars>checkVariables (line 92)

Second argument must be a vector of symbolic variables.

Error in sym.getEqnsVars (line 56)

checkVariables(vars);

Error in sym/solve>getEqns (line 429)

[eqns, vars] = sym.getEqnsVars(argv{:});

Error in sym/solve (line 226)

[eqns,vars,options] = getEqns(varargin{:});

Error in Untitled211 (line 31)

solve_u1_for_x = solve(u1,(0:1:4))

[Mohamed Magid]

for instance when I want to solve the next part I recieved this massage ( error using digits line 24 )

x = (0:1:L/2);
SFnhac = VAh-W1*x
u1 = m1
u11=atan(u1,L/2)
u1ac = vpa(u1,(0:1:(L/2)))
u2 = 1/((1+m1^2)^0.5)

u2ac = vpa(u2,(0:1:4))
u3=u1*u2
u3ac = vpa(subs(u3,(0:1:4)))
Qac = SFnhac*u2-H_riser*u3
subs(Qac)

[Walter Roberson]

I am not sure why you are not being consistent about what you substitute.

X = (0:1:L/2);
SFnhac = VAh-W1*x
u1 = m1
u11=atan(u1,L/2)
u1ac = vpa(subs(u1,x,X))
u2 = 1/((1+m1^2)^0.5)

u2ac = vpa(subs(u2, x, 0:1:4))
u3=u1*u2
u3ac = vpa(subs(u3, x, 0:1:4))
Qac = SFnhac*u2-H_riser*u3
subs(Qac, x, X)