Autolisp if not nil

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August undefined, 2024

WebNext Page. Following table shows all the relational operators supported by LISP that compares between numbers. However unlike relational operators in other languages, LISP comparison operators may take more than two operands and they work on numbers only. Assume variable A holds 10 and variable B holds 20, then −. Operator. Description. … WebJul 9, 2024 · It is basically meant for checking whether a given list is empty, but since the empty list is equivalent to nil, it will work (as the examples on the linked page point out): ( null ' ()) => T ( null nil) => T ( null t) => NIL ( …

概要 - オブジェクトの図形名にアクセスする(AutoLISP)

WebAll AutoLISP functions return a value to the function that called them. The letter T is the symbol for “true” in AutoLISP, and adding it causes the function to return a true value. The way gpmain.lsp is structured, each input function it calls must return a value other than nil (which indicates “no value”) for the program to proceed to ... WebOct 26, 2001 · If you are worried about Visual Lisp because it uses ActiveX (so doesn't work on Mac or Core Console), that only concerns the functions with names starting with vla- or vlax-. (I'm not sure about reactors, i.e. vlr-). The ones starting with vl- do not have this problem; many of them are pretty much copies of corresponding Common Lisp functions. elastic long-tail cast on

Is an empty list in Lisp built from a cons cell? - Stack Overflow

WebOct 22, 2024 · The common LISP operators are listed below in the table: Example: LISP Program that demonstrates Logical operators on numbers Lisp Output: 50 50 NIL NIL Example 2: LISP Program to demonstrate Logical operators on Boolean values Lisp Output: NIL T NIL T 1. Comparison Operators in LISP 3. Arithmetic Operators in LISP 4. … WebMar 6, 2024 · Common Lispの条件分岐についてのメモです。条件分岐のためのコマンドと、それらを使うのに必要な基本的な演算子や関数をまとめておきます。真偽値 common lispでは、空リストが唯一の偽値です。それ以外は全て真となります。なお、'(), (), nil, 'nilは空リストとして扱われます。 WebThe *error* function is a user-definable function which will be evaluated when AutoCAD encounters an error when executing an AutoLISP expression. The *error* function takes … food container in chinese

AutoLISP - Wikipedia

Web1.3.2 nil and t. In Emacs Lisp, the symbol nil has three separate meanings: it is a symbol with the name ‘nil’; it is the logical truth value false; and it is the empty list—the list of … WebIf the test returns false or nil, then ifevaluates the third argument if it exists, otherwise if returns nil. The following shows the syntax of the if function. (if testexpr thenexpr [elseexpr]) Arguments testexpr Expression to be tested. thenexpr Expression evaluated if testexpr is not nil. elseexpr Expression evaluated if testexpr is nil. food containers 80sWeb(defun mid(/ pt1 pt2) (setq pt1 (getpoint"\nEnter First Point: ") pt2 (getpoint"\nEnter Second Point: ") ) (polar pt1 (angle pt1 pt2) (/ (distance pt1 pt2) 2.0 ... elastic loom patterns

"WebCommon LISP provides three logical operators: and, or, and not that operates on Boolean values. Assume A has value nil and B has value 5, then − Example Create a new source code file named main.lisp and type the following code in it. Live Demo " - Autolisp if not nil

Autolisp if not nil

Test variable is bound and non-nil - Emacs Stack Exchange

Webdocumentation.HELP! AutoCad AutoLISP Functions Documentation AutoLISP Reference Guide AutoCad AutoLISP Functions WebSep 15, 2008 · Evaluates a test expression, and if it is not nil, evaluates other expressions; repeats this process until the test expression evaluates to nil The PROGN …

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WebApr 1, 2024 · といったように、「はい」の時は T、「いいえ」の時は nil が戻ってきます。 nil 何もない. nil には何もない。という意味もあるので、例えば、何も情報が入ってない … WebJul 2, 2024 · Autodesk does not warrant, either expressly or implied, the accuracy, reliability or completeness of the information translated by the machine translation service and will not be liable for damages or losses caused by the trust placed in the translation service. Translate Error: bad argument type: consp nil 5 REPLIES SOLVED

WebNov 16, 2024 · Therefore one can use tailp here for this specific test, whether a given list ends with NIL. listp is a lisp-convention conform name for this. (predicate functions returning booleans ending with p for predicate. Since no - used in the name, attach p without - otherwise attach -p ). Webthe use of an empty list, and uses the notation nilwhen it is desirable to emphasize the use of the Boolean ``false''. The notation 'nil(note the explicit quotation mark) is used to emphasize the use of a symbol. For example: (defun three () 3) ;Emphasize empty parameter list (append '() '()) => () ;Emphasize use of empty lists

WebFeb 28, 2024 · AutoLISP 比較演算関数と条件関数の使い方 sell AutoLISP, AutoCAD 比較演算関数と条件関数リファレンス（公式ヘルプ）値が等しいか調べる = (= 1 1) ;; -> T (= "a" "a") ;; -> T (= 4 (+ 1 2)) ;; -> nil (= "a" "A") ;; -> nil 値が等しくないかか調べる /= (/= 1 1) ;; -> nil (/= "a" "a") ;; -> nil (/= 4 (+ 1 2)) ;; -> T (/= "a" "A") ;; -> T 数値の大きさを比べる < <= … WebMay 28, 2014 · Condition on nil selection set. lisp; By subodh_gis May 27, 2014 in AutoLISP, Visual LISP & DCL. Share More sharing options... Followers 3. Reply to this …

WebApr 8, 2024 · Hi all, is it possible to modify this to only Gap other Lines that are CROSSING (the selected Lines). The below will do this if they are just Touching, I need them to actually Cross one another

Webforms. If every formbut the last evaluates to a non-nilvalue, andreturns whatever the last formreturns. Therefore in general andcan be used both for logical operations, where nilstands for falseand non-nilvalues stand for true, An example follows. (if (and (>= n 0) (< n (length a-simple-vector)) elastic loops for sewingWebAutoLISP is a dialect of the programming language Lisp built specifically for use with the full version of AutoCAD and its derivatives, ... NIL ZIL (Zork ... the princ function returns a … elastic luggage covers with papillon dogsWebNov 20, 2014 · bound-and-true-p is a Lisp macro in `bindings.el'. (bound-and-true-p VAR) Return the value of symbol VAR if it is bound, else nil. Share. Improve this answer. … elastic man choirWeb(setq a '(x y z)) (setq b '(x y z)) (setq c b) (eq a c) would return nil, a and c are not the same list. (eq c b) would return true, b and c are exactly the same list. The (equal) function … food container lids replacementWebThese variables do not remain available after the calling function has completed its task. ... This is why the message var-scope is nil is returned when checking to see if the variable is nil. If var-scope was not added to the local variables list for the function, ... (AutoLISP) Local variables are only accessible within the user-defined ... elastic loops for coatsWebMay 17, 2013 · NIL is somewhat a strange beast in Common Lisp because it's a symbol (meaning that symbolp returns T) is a list is NOT a cons cell ( consp returns NIL) you can take CAR and CDR of it anyway Note that the reasons behind this are probably also historical and you shouldn't think that this is the only reasonable solution. elastic lumbar support beltWebFeb 7, 2024 · 1 The first one should work when you remove the parentheses around the numbers (change (1) (0) to 1 0 ). You could also use integerp instead of (typep ... 'integer) – jkiiski Feb 6, 2024 at 17:11 next time please copy and paste your code AND the error message you got. we will teach you how to understand the error messages. – sds Feb 7, … elastic loom bands