MATLAB Central Newsreader - inputParser not validating serial object correctly

inputParser not validating serial object correctly

"G.A.M. — Sun, 23 Sep 2007 01:42:44 -0400

My error msg is:
Argument 'serialPort' failed validation @(sp)isa(sp,'serial').

My code is:

function status = DoSomethingWithSerialPort(serialPort, varargin)

p = inputParser;
p.addRequired('serialPort', @(sp)isa(sp, 'serial'));
p.addParamValue('test','', @ischar);
p.parse('serialPort', varargin{:});
test= p.Results.test;
%etc.

After getting the error, I checked the class of the function
parameter, and it was as expected:
class(serialPort)
ans = serial

Then, to continue debugging, I created this anonymous function in the
workspace:
x = @(sp)isa(sp, 'serial')

I used it to check the input parameter and it was again as expected:
x(serialPort)
ans = 1

So does anyone have any idea why I get the error shown at the top?
Thanks.

Re: inputParser not validating serial object correctly

Philip Borghesani — Mon, 24 Sep 2007 14:08:17 -0400

You have the inputs to parse wrong try:
p.parse(varargin{:});
or
parse(p,varargin{:})

Phil

"G.A.M." <x0Zero@gmail.com> wrote in message news:1190511764.536671.125930@y42g2000hsy.googlegroups.com...
> My error msg is:
> Argument 'serialPort' failed validation @(sp)isa(sp,'serial').
>
> My code is:
>
> function status = DoSomethingWithSerialPort(serialPort, varargin)
>
> p = inputParser;
> p.addRequired('serialPort', @(sp)isa(sp, 'serial'));
> p.addParamValue('test','', @ischar);
> p.parse('serialPort', varargin{:});
> test= p.Results.test;
> %etc.
>
> After getting the error, I checked the class of the function
> parameter, and it was as expected:
> class(serialPort)
> ans = serial
>
> Then, to continue debugging, I created this anonymous function in the
> workspace:
> x = @(sp)isa(sp, 'serial')
>
> I used it to check the input parameter and it was again as expected:
> x(serialPort)
> ans = 1
>
> So does anyone have any idea why I get the error shown at the top?
> Thanks.
>

Is Matlab Help incorrect Re: inputParser (parser is not validating serial object correctly)

"G.A.M. — Tue, 25 Sep 2007 15:55:02 -0400

>
> "G.A.M." <x0Z...@gmail.com> wrote in messagenews:1190511764.536671.125930@y42g2000hsy.googlegroups.com...
> > My error msg is:
> > Argument 'serialPort' failed validation @(sp)isa(sp,'serial').
>
> > My code is:
>
> > function status = DoSomethingWithSerialPort(serialPort, varargin)
>
> > p = inputParser;
> > p.addRequired('serialPort', @(sp)isa(sp, 'serial'));
> > p.addParamValue('test','', @ischar);
> > p.parse('serialPort', varargin{:});
> > test= p.Results.test;
> > %etc.
>
> > After getting the error, I checked the class of the function
> > parameter, and it was as expected:
> > class(serialPort)
> > ans = serial
>
> > Then, to continue debugging, I created this anonymous function in the
> > workspace:
> > x = @(sp)isa(sp, 'serial')
>
> > I used it to check the input parameter and it was again as expected:
> > x(serialPort)
> > ans = 1
>
> > So does anyone have any idea why I get the error shown at the top?
> > Thanks.

On Sep 24, 10:08 am, "Philip Borghesani"
<philip_borghes...@mathworks.spam> wrote:
> You have the inputs to parse wrong try:
> p.parse(varargin{:});
> or
> parse(p,varargin{:})
>
> Phil

Phil-thanks for your reply.
Matlab help on input parser gives this example:

function publish_ip(script, varargin)
p = inputParser;
p.addRequired('script', @ischar);
p.addOptional(...
[snip]
p.parse(script, varargin{:});

That's the example I'm following and I have used this style in a lot
of places in my code where it has seemingly worked correctly.

What I took from the example is that required arguments need to be
named in the call to parse().

1. Is the example code I posted originally an incorrect implementation
of what is shown in Matlab help?
2. Am I misunderstanding the example?
3. Is the help example incorrect?

Here's the help section I'm viewing:
inputParser :: Functions (MATLAB Function Reference)
help/techdoc/help.jar!/ref/inputparser.html

Re: Is Matlab Help incorrect Re: inputParser (parser is not validating serial object correctly)

G.A.M. — Tue, 02 Oct 2007 14:56:18 -0400

"G.A.M." <x0Zero@gmail.com> wrote in message
<1190735702.705426.76450@50g2000hsm.googlegroups.com>...
>
> >
> > "G.A.M." <x0Z...@gmail.com> wrote in
messagenews:1190511764.536671.125930@y42g2000hsy.googlegroups.com...
> > > My error msg is:
> > > Argument 'serialPort' failed validation
@(sp)isa(sp,'serial').
> >
> > > My code is:
> >
> > > function status =
DoSomethingWithSerialPort(serialPort, varargin)
> >
> > > p = inputParser;
> > > p.addRequired('serialPort', @(sp)isa(sp, 'serial'));
> > > p.addParamValue('test','', @ischar);
> > > p.parse('serialPort', varargin{:});
> > > test= p.Results.test;
> > > %etc.
> >
> > > After getting the error, I checked the class of the
function
> > > parameter, and it was as expected:
> > > class(serialPort)
> > > ans = serial
> >
> > > Then, to continue debugging, I created this anonymous
function in the
> > > workspace:
> > > x = @(sp)isa(sp, 'serial')
> >
> > > I used it to check the input parameter and it was
again as expected:
> > > x(serialPort)
> > > ans = 1
> >
> > > So does anyone have any idea why I get the error shown
at the top?
> > > Thanks.
>
>
> On Sep 24, 10:08 am, "Philip Borghesani"
> <philip_borghes...@mathworks.spam> wrote:
> > You have the inputs to parse wrong try:
> > p.parse(varargin{:});
> > or
> > parse(p,varargin{:})
> >
> > Phil
>
> Phil-thanks for your reply.
> Matlab help on input parser gives this example:
>
> function publish_ip(script, varargin)
> p = inputParser;
> p.addRequired('script', @ischar);
> p.addOptional(...
> [snip]
> p.parse(script, varargin{:});
>
> That's the example I'm following and I have used this
style in a lot
> of places in my code where it has seemingly worked correctly.
>
> What I took from the example is that required arguments
need to be
> named in the call to parse().
>
> 1. Is the example code I posted originally an incorrect
implementation
> of what is shown in Matlab help?
> 2. Am I misunderstanding the example?
> 3. Is the help example incorrect?
>
> Here's the help section I'm viewing:
> inputParser :: Functions (MATLAB Function Reference)
> help/techdoc/help.jar!/ref/inputparser.html
>
>

I could sure use some help on this. I am continuing to
struggle with the apparent differences in the help
documentation for the inputParser vs. what actually works. I
have not solved the issue I asked about in my original post
yet. The only suggestion (to not parse the required
arguments) doesn't seem satisfactory and it doesn't agree
with the help docs. What am I missing? Thanks.

Re: inputParser not validating serial object correctly

per isakson — Tue, 02 Oct 2007 17:07:44 -0400

"G.A.M." <x0Zero@gmail.com> wrote in message
<1190511764.536671.125930@y42g2000hsy.googlegroups.com>...
> My error msg is:
> Argument 'serialPort' failed validation @(sp)isa
(sp,'serial').
>
> My code is:
>
> function status = DoSomethingWithSerialPort(serialPort,
varargin)
>
> p = inputParser;
> p.addRequired('serialPort', @(sp)isa(sp, 'serial'));
> p.addParamValue('test','', @ischar);
> p.parse('serialPort', varargin{:});
> test= p.Results.test;
> %etc.
>
> After getting the error, I checked the class of the
function
> parameter, and it was as expected:
> class(serialPort)
> ans = serial
>
> Then, to continue debugging, I created this anonymous
function in the
> workspace:
> x = @(sp)isa(sp, 'serial')
>
> I used it to check the input parameter and it was again
as expected:
> x(serialPort)
> ans = 1
>
> So does anyone have any idea why I get the error shown at
the top?
> Thanks.
>

The example, publish_ip, in the documentation uses the same
name ("script") for both the name of the required variable
and the variable itself, which is asking for mistakes.

In this line

p.parse( serialPort, varargin{:});

<serialPort> is the name of the input variable. You have
two blips too many.

/ per

Re: inputParser not validating serial object correctly

"G.A.M. — Wed, 03 Oct 2007 03:02:04 -0400

On Oct 2, 1:07 pm, "per isakson" <poi.nos...@bimDOTkthDOT.se> wrote:
> "G.A.M." <x0Z...@gmail.com> wrote in message
>
> <1190511764.536671.125...@y42g2000hsy.googlegroups.com>...
>
>
>
> > My error msg is:
> > Argument 'serialPort' failed validation @(sp)isa
> (sp,'serial').
>
> > My code is:
>
> > function status = DoSomethingWithSerialPort(serialPort,
> varargin)
>
> > p = inputParser;
> > p.addRequired('serialPort', @(sp)isa(sp, 'serial'));
> > p.addParamValue('test','', @ischar);
> > p.parse('serialPort', varargin{:});
> > test= p.Results.test;
> > %etc.
>
> > After getting the error, I checked the class of the
> function
> > parameter, and it was as expected:
> > class(serialPort)
> > ans = serial
>
> > Then, to continue debugging, I created this anonymous
> function in the
> > workspace:
> > x = @(sp)isa(sp, 'serial')
>
> > I used it to check the input parameter and it was again
> as expected:
> > x(serialPort)
> > ans = 1
>
> > So does anyone have any idea why I get the error shown at
> the top?
> > Thanks.
>
> The example, publish_ip, in the documentation uses the same
> name ("script") for both the name of the required variable
> and the variable itself, which is asking for mistakes.
>
> In this line
>
> p.parse( serialPort, varargin{:});
>
> <serialPort> is the name of the input variable. You have
> two blips too many.
>
> / per

Thank you very much. I have looked at this example many times and I
never noticed the fact that I had the extra blips.