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From: Abhishek on 20 Jul 2010 01:37
hi i am reading the file
x
z
o,p,q,r,s,t,u,v,w,x,T
A*p+B*u
y*p+D*q+E*r+F*s
G*q+H*r+I*t
J*q+K*s+L*x
M*r+N*o+O*t+2*x*P
2*x*Q+R*o+S1*s+P*t+U*T+V*z
W*o+N*t+X*T+R*2*x+Y*v
d*w+e*v+f*u
g*u+h*p+i*w+j*v
k*v+l*o+m*w+n*u
Z*T+2*x*a+b*z+c*o

using
fid=fopen('/sim/TLV1117LV_DS/x0138322/scripts/userinput.m');
while(1)
tline1 = fgetl(fid);

if ~ischar(tline1), break, end
TL1 = sym(tline1);

end
but it is returning TL1=
[empty sym]
tell me a solution;
thank you in advance
From: Walter Roberson on 20 Jul 2010 04:12
Abhishek wrote:
> hi i am reading the file
> x
> z
> o,p,q,r,s,t,u,v,w,x,T
> A*p+B*u
> y*p+D*q+E*r+F*s
> G*q+H*r+I*t
> J*q+K*s+L*x
> M*r+N*o+O*t+2*x*P
> 2*x*Q+R*o+S1*s+P*t+U*T+V*z
> W*o+N*t+X*T+R*2*x+Y*v
> d*w+e*v+f*u
> g*u+h*p+i*w+j*v
> k*v+l*o+m*w+n*u
> Z*T+2*x*a+b*z+c*o
>
> using
> fid=fopen('/sim/TLV1117LV_DS/x0138322/scripts/userinput.m');
> while(1) tline1 = fgetl(fid);
> if ~ischar(tline1), break, end
> TL1 = sym(tline1);
>
> end
> but it is returning TL1=
> [empty sym]
> tell me a solution;
> thank you in advance

sym() is not documented as being able to take a string which is a
symbolic expression: strings are documented only to be valid if they
indicate variable names or symbolic numbers. A generous interpretation
of "symbolic number" might allow for the possibility (I cannot test
this), but if so then your line with the string of variables separated
by commas would at best have the result of assigning an "expression
list" to TL1 rather than necessarily creating variables with each of the
mentioned names.


Also, there is the possibility that your file has an empty line right
before end of file. If that were to be the case, then because you do not
check that the string is non-empty or non-blank, you would be attempting
to create a symbolic variable with an empty name, which would be the
empty symbol.
From: Abhishek on 20 Jul 2010 04:51
Walter Roberson <roberson(a)hushmail.com> wrote in message <XTc1o.10562$Zp1.7179(a)newsfe15.iad>...
> Abhishek wrote:
> > hi i am reading the file
> > x
> > z
> > o,p,q,r,s,t,u,v,w,x,T
> > A*p+B*u
> > y*p+D*q+E*r+F*s
> > G*q+H*r+I*t
> > J*q+K*s+L*x
> > M*r+N*o+O*t+2*x*P
> > 2*x*Q+R*o+S1*s+P*t+U*T+V*z
> > W*o+N*t+X*T+R*2*x+Y*v
> > d*w+e*v+f*u
> > g*u+h*p+i*w+j*v
> > k*v+l*o+m*w+n*u
> > Z*T+2*x*a+b*z+c*o
> >
> > using
> > fid=fopen('/sim/TLV1117LV_DS/x0138322/scripts/userinput.m');
> > while(1) tline1 = fgetl(fid);
> > if ~ischar(tline1), break, end
> > TL1 = sym(tline1);
> >
> > end
> > but it is returning TL1=
> > [empty sym]
> > tell me a solution;
> > thank you in advance
>
> sym() is not documented as being able to take a string which is a
> symbolic expression: strings are documented only to be valid if they
> indicate variable names or symbolic numbers. A generous interpretation
> of "symbolic number" might allow for the possibility (I cannot test
> this), but if so then your line with the string of variables separated
> by commas would at best have the result of assigning an "expression
> list" to TL1 rather than necessarily creating variables with each of the
> mentioned names.
>
>
> Also, there is the possibility that your file has an empty line right
> before end of file. If that were to be the case, then because you do not
> check that the string is non-empty or non-blank, you would be attempting
> to create a symbolic variable with an empty name, which would be the
> empty symbol.
>thanks
>but tell me how to check whether the string is empty or not and where to check it ??
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