s-function within s-function
in [Matlab]
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From: Timothy Tan on 3 Jun 2010 01:05 Hi, Just wondering what if I've got two separate s-functions. And I've already initialized s-function 2, and only want to evaluate s-function 2 within s-function 1 as part of s-function 1 during MdlOutputs? I can evaluate s-function 2 fine in the Matlab command prompt, just not within another S-function. Cheers On Apr 30, 10:04 am, "Guy Rouleau" <guy.rouleau.nos...(a)mathworks.com> wrote: > "John Quincy" <q.joh...(a)gmail.com> wrote in message <hr9of1$1...(a)fred.mathworks.com>... > > This question might not make sense, I am still a beginner. Is it possible to call an s-function from inside another s-function. Say when calculating my output I want to call one s-function in my input is something and another if the input is something else. Would something like this be possible or am I going about this the wrong way. > > > Thanks, > > Hi, > > I would vote for the wrong way ;-) > > If you want to execute a different computation based on an input signal value, I would either: > > - Implement 2 s-functions. You can then select the one to use by placing them in If action subsystems or just using a switch block. > > - Implement 1 s-function and use an IF statement in your s-function code (probably in MdlOutputs and maybe also in MdlDerivative and MdlUpdate). This approach might be easier if your s-function has states. > > Also, if what you want is not calling "an -sfunction inside and s-function" but calling legacy code from an s-function, then you might want to look at the S-function Builder block or the Legacy code Tool. > > HTH, > Guy
From: Timothy Tan on 3 Jun 2010 01:13 I should probably also mention that s-function 2 has been compiled to a mex, was in Fortran prior. Cheers, Tim On Jun 3, 5:05 pm, Timothy Tan <timothy....(a)gmail.com> wrote: > Hi, > > Just wondering what if I've got two separate s-functions. And I've > already initialized s-function 2, and only want to evaluate s-function > 2 within s-function 1 as part of s-function 1 during MdlOutputs? > > I can evaluate s-function 2 fine in the Matlab command prompt, just > not within another S-function. > > Cheers > > On Apr 30, 10:04 am, "Guy Rouleau" <guy.rouleau.nos...(a)mathworks.com> > wrote: > > > > > "John Quincy" <q.joh...(a)gmail.com> wrote in message <hr9of1$1...(a)fred.mathworks.com>... > > > This question might not make sense, I am still a beginner. Is it possible to call an s-function from inside another s-function. Say when calculating my output I want to call one s-function in my input is something and another if the input is something else. Would something like this be possible or am I going about this the wrong way. > > > > Thanks, > > > Hi, > > > I would vote for the wrong way ;-) > > > If you want to execute a different computation based on an input signal value, I would either: > > > - Implement 2 s-functions. You can then select the one to use by placing them in If action subsystems or just using a switch block. > > > - Implement 1 s-function and use an IF statement in your s-function code (probably in MdlOutputs and maybe also in MdlDerivative and MdlUpdate). This approach might be easier if your s-function has states. > > > Also, if what you want is not calling "an -sfunction inside and s-function" but calling legacy code from an s-function, then you might want to look at the S-function Builder block or the Legacy code Tool. > > > HTH, > > Guy
From: Timothy Tan on 3 Jun 2010 19:49
Hi there, I've managed to do what I want now. Cheers, Tim On Jun 3, 5:13 pm, Timothy Tan <timothy....(a)gmail.com> wrote: > I should probably also mention that s-function 2 has been compiled to > a mex, was in Fortran prior. > > Cheers, > Tim > > On Jun 3, 5:05 pm, Timothy Tan <timothy....(a)gmail.com> wrote: > > > > > Hi, > > > Just wondering what if I've got two separate s-functions. And I've > > already initialized s-function 2, and only want to evaluate s-function > > 2 within s-function 1 as part of s-function 1 during MdlOutputs? > > > I can evaluate s-function 2 fine in the Matlab command prompt, just > > not within another S-function. > > > Cheers > > > On Apr 30, 10:04 am, "Guy Rouleau" <guy.rouleau.nos...(a)mathworks.com> > > wrote: > > > > "John Quincy" <q.joh...(a)gmail.com> wrote in message <hr9of1$1...(a)fred..mathworks.com>... > > > > This question might not make sense, I am still a beginner. Is it possible to call an s-function from inside another s-function. Say when calculating my output I want to call one s-function in my input is something and another if the input is something else. Would something like this be possible or am I going about this the wrong way. > > > > > Thanks, > > > > Hi, > > > > I would vote for the wrong way ;-) > > > > If you want to execute a different computation based on an input signal value, I would either: > > > > - Implement 2 s-functions. You can then select the one to use by placing them in If action subsystems or just using a switch block. > > > > - Implement 1 s-function and use an IF statement in your s-function code (probably in MdlOutputs and maybe also in MdlDerivative and MdlUpdate). This approach might be easier if your s-function has states. > > > > Also, if what you want is not calling "an -sfunction inside and s-function" but calling legacy code from an s-function, then you might want to look at the S-function Builder block or the Legacy code Tool. > > > > HTH, > > > Guy |