Re: coulomb + viscous friction

On 10/25/2012 1:28 AM, Nasser M. Abbasi wrote:
> On 10/25/2012 12:36 AM, lady firmament wrote:
>> v1=0.0001;v2=-0.0001;vp=-1:1;
>> Fc_p=57;Fc_n=28:Fs_p=175;Fs_n=110;s2_p=130;s2_n=130;
>> if vp>=0
>> if vp>=v1
>> Fr=Fc_p+s2_p*vp
>> else
>> Fr= vp/v1*Fc_p
>> end
>> else
>> if vp<=v2
>> Fr=vp/v2*Fc_n
>> else
>> Fr=Fc_n+ s2_n*vp
>> end
>> end
>> plot(vp,Fr)
>> I wanna plot above program for (coulomb + viscous friction) . But The program
>> cannot connect the term( Fr= Fc_p+ s2_p*vp). Is my declareation wrong ? Is there anyone to help me?
>>
>

> why not use Matlab code analyzer?
>
> 2: Parse error at '=': usage might be invalid MATLAB syntax.
> 3: Variable 'vp' might be set by a nonscalar operator.
> 4: Variable 'vp' might be set by a nonscalar operator.
> 5: Terminate statement with semicolon to suppress output (within a script).
> 7: Terminate statement with semicolon to suppress output (within a script).
> 10: Variable 'vp' might be set by a nonscalar operator.
> 11: Terminate statement with semicolon to suppress output (within a script).
> 13: Terminate statement with semicolon to suppress output (within a script)
>
>

Not only you have syntax error, but your 'vp' is an
array.

You can't just type

       if vp>=0

when vp is a vector or a matrix.