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From: roy michaeli on 8 Jun 2010 10:53
hello to you all.
i am getting the error:
??? Undefined function or method 'eval' for input arguments of type 'double'.

Error in ==> reaction at 6
a=trapz(x,x.*eval(q))

Error in ==> project at 4
[r1,r2]=reaction(fl,fs,j1,j2,q,leng)

it seems like the transfer of the vars between the function does not work well..
The var q changes it's value from the string 'x+0.*x' to (9)
thanks in advance.
roy




clc
clear all
[fl,fs,q,leng,j1,j2]=kelet
[r1,r2]=reaction(fl,fs,j1,j2,q,leng)

function [fl,fs,q,leng,j1,j2]=kelet
a=0;
k=1;
leng=input('please enter length: ')
j1=input('please enter position of 1st joint: ')
j2=input('please enter position of 2nd joint: ')
if j1>j2
temp=j1
j1=j2
j2=temp
end
q1=input('function of force')
q2='+x.*0'
q=[q1,q2]
while a==0
dummy=input('please enter position of force: ')
if dummy<=leng
fl(1,k)=[dummy];
fs(1,k)=[input('please enter size of force: ')]
k=k+1;
else
a=1;
end
end

function [r1 r2]=reaction(leng,fl,fs,q,j1,j2)
s=size(fl)
s=s(2)
ff=fl.*fs
x=0:0.01:leng;
a=trapz(x,x.*eval(q))
x=0:0.01:leng;
%reactions
x=0:0.01:leng;
rs=[j1 j2 ; 1 1]\[sum(ff)+a ; sum(fs)+trapz(x,eval(q))]
r1=-rs(1,1)
r2=-rs(2,1)
end
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