mit-scheme

问题 I'm going through SICP course and as recommended installed mit-scheme. I want to use the REPL together with a scheme file. The reason is because I can add scheme code in the file and then run the commands in REPL. What I have works, but the problem is every time I edit the file, I have to quit terminal and reload the file for REPL to see changes. Is there a way to reload the file easily or some other way for REPL to see changes from the file? This my setup: I installed mit-scheme with brew

问题 I am working through SICP, and the exercise I am working on asks for a procedure that returns the last element in a list. I implemented the procedure last-pair to do this, but I'm confused why it's returning a list rather than a number: (define (last-pair alist) (cond ((null? (cdr alist)) (car alist)) ; still happens if this is just "car alist)" (else (last-pair (cdr alist))))) When I invoke it on a list of the integers from 1 to 5, I get the output '(5): > (last-pair (list 1 2 3 4 5)) '(5) I

问题 I'm using the Edwin editor with MIT-scheme, and because the default font size is so small, I do M-x set-font and then choose -adobe-courier-bold-r-normal--24-240-75-75-m-150-iso8859-1 to make the font bigger. This works fine, but when I try to put (set-font "-adobe-courier-bold-r-normal--24-240-75-75-m-150-iso8859-1") in my ~/.edwin , it complains about Unbound variable: set-font . In emacs, interactive functions from M-x can usually be straightforwardly called programmatically in Elisp, but

问题 In the book Structure and Interpretation of Computer Programs by H. Abelson and G. J. Sussman with J. Sussman, the accumulation or fold-right is introduced in Section 2.2.3 as follows: (define (accumulate op initial sequence) (if (null? sequence) initial (op (car sequence) (accumulate op initial (cdr sequence))))) I tried to use this to take the and of a list of Boolean variables, by writing: (accumulate and true (list true true false)) However, this gave me the error and: bad syntax in

问题 I'm attempting to return a variable in the scope of a different environment. What I have currently is (define make-empty-env (lambda() (make-top-level-environment) ) ) which creates a new environment when you call it from the interpreter i.e. (define env (make-empty-env)) If I define the variable "a" as 15 in "env", my goal is to return this value through a function called from the user-initial-environment. Something along the lines of (apply-env env 'v) outputs -> value of variable v in

问题 MIT Scheme's (load ...) procedure apparently takes in an environment as a parameter. Is there any way I could "clone" the current environment and pass it there, so that I can isolate the file's environment from my own? (I've looked here but I haven't found anything...) 回答1: How about something like this ? (define (clone-env env) (let ((bindings (environment-bindings env))) (make-top-level-environment (map car bindings) (map cadr bindings)))) 1 ]=> (define foo 1) ;Value: foo 1 ]=> (eq? (the

问题 I want to evaluate a script from makefile and exit, like this mit-scheme --load "fact.scm" However, after it evaluates the file, it does not exit, and the repl appears; if I try the (exit) primitive, it asks for confirmation y/n. Is it possible to solve this ? 回答1: For Unix mit-scheme reads the input files via redirection: mit-scheme < /usr/cph/foo.in > /usr/cph/foo.out 2>&1 & This is taken from the documentation http://www.gnu.org/software/mit-scheme/documentation/mit-scheme-user/Command

问题 I want to evaluate a script from makefile and exit, like this mit-scheme --load "fact.scm" However, after it evaluates the file, it does not exit, and the repl appears; if I try the (exit) primitive, it asks for confirmation y/n. Is it possible to solve this ? 回答1: For Unix mit-scheme reads the input files via redirection: mit-scheme < /usr/cph/foo.in > /usr/cph/foo.out 2>&1 & This is taken from the documentation http://www.gnu.org/software/mit-scheme/documentation/mit-scheme-user/Command

问题 I have installed SublimeREPL, and now I am trying to customize the interpreters a bit. How can I add MIT Scheme to the Tools->SublimeREPL menu? I am new to Sublime Text 2. 回答1: You can read documentation about configuring additional REPLs here:http://sublimerepl.readthedocs.org/en/latest/#basics-of-language-integration-configuration-and-launch-commands And take a look at existing Scheme configuration here: https://github.com/wuub/SublimeREPL/tree/master/config/Scheme Most Scheme/Lisp dialects

问题 I want to type something like 'scheme file.scm' and have it interpret the file, and then take me back to my shell, rather than loading it in the REPL. edit: I tried scheme < test.scm and it still uses the REPL, the only difference is that scheme exits when the stream ends. 回答1: scheme < file.scm should work (as long as you don't specify --interactive and stdin is not a terminal, scheme works non-interactively). 回答2: To run a scheme program using MIT Scheme: scheme --quiet < program.scm The -