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    <p>I wouldn't expect F# to be a drop-in replacement for Matlab/R, because unlike them, F# is a general purpose programming language. Not everything you need for a specific type of work will be in the standard libraries. But that doesn't mean that the "interactive development" you describe is impossible, it may just require some effort up-front to build the library functions you depend on.</p> <p>For #1, as was mentioned earlier, adding type annotations is unfortunately necessary in some cases, but also the <code>inline</code> keyword and "hat-types" can <a href="http://codebetter.com/blogs/matthew.podwysocki/archive/2009/06/11/f-duck-typing-and-structural-typing.aspx" rel="nofollow noreferrer">give you duck-typing</a>.</p> <p>For #2, I'm not clear on what your <code>open</code> and <code>process</code> functions do, versus what you want them to do. For example, the <code>open</code> function could:</p> <ul> <li>Read the entire file at once, return the data as an array/list/etc, and then close the file</li> <li>Return a <code>FileStream</code> object, which you're calling <code>process</code> on but forget to close.</li> <li>Return a sequence expression so you can lazily iterate over the file contents</li> <li><a href="http://blogs.msdn.com/dsyme/archive/2007/05/31/a-sample-of-the-memoization-pattern-in-f.aspx" rel="nofollow noreferrer">Memoize</a> the result of one of the above, so that subsequent calls just return the cached result</li> <li>One of the gazillion other ways to create an abstraction over file access.</li> </ul> <p>Some of these are better suited for your task than others. Compared to Matlab &amp; R, a general purpose language like F# gives you more ways to shoot yourself in the foot. But that's because it gives you more ways to do everything.</p>
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    1. COI meant open in the Matlab/R style. It opens a csv file, say, and puts it into a big array/matrix. My worry is that if I then select and run that code again, which happens in an interactive development style, I'll have two big matrices, one that is shadowed copied. Am I correct?
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    2. CO@Tristan: The .Net garbage collection should get rid of the extra "shadow copies" as you refer to them. The original post sounded like you had tried this and it was a problem. Now, it sounds like you are just guessing that this will be a problem. Could you clear that up?
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    3. CO@John: Yes I am guessing. I am trying to figure out whether ``let = x 1;; let x = 2;;`` is the same as `x' going out of scope. Does x = 1 object get marked for deletion as soon as I do ``let x = 2``? Chris Smith's book refers to this as shadowing.
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