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Re: Need test run in Matlab

From: John W. Eaton
Subject: Re: Need test run in Matlab
Date: Tue, 29 Jan 2019 10:15:36 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1

On 1/28/19 4:03 PM, Michele wrote:
Dear jwe,

I attach the resulting diary.

Thanks. Unfortunately, those tests may not have been the right ones to run to answer my questions. I'm trying to figure out when eval will parse something like

  eval ("foo -opt")

as an expression (subtract the value of opt from foo) or as a command (call the function foo with the character string argument "-opt"). It seems as though eval may never evaluate its argument as a command-style function call if it is called with an output value:

  val = eval ("foo -opt")

Is that correct?  I suppose this would be similar to writing

  val = foo -opt

in which case the "foo -opt" part is not recognized as a command-style function call because that can only happen at the beginning of an expression.

Also the idea of the test like this:

  function f (foo)
    eval ("foo -opt")
  f ()
  f (1)

was to determine whether the mere existence of a symbol was sufficient for eval to treat this as a subtraction or is it necessary for the function parameter "foo" to be defined?

Also, is this different without the eval?  What happens for something like

  function f (foo)
    foo -opt

Is this always handled as a subtraction or does it depend on whether f is called with an argument?

In both cases, I'm assuming the function "foo" exists.

I'll try to come up with another set of tests.


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