The isAtom function returns true if {obj} is not a Pair; otherwise false is returned; (remember that lists are constructed of pairs chained together)


Use the isAtom function to distinguish between Lists and non-Lists during list processing, rule base processing, or other Artificial Intelligence techniques. The flip side of the isAtom function is the isPair function. When isPair is true, isAtom is always false and vice versa.




(isAtom obj)

Arguments Name Type Description
Argument:objCharacter String Symbol Vector BitVector ByteVector IntVector FltVector ObjVector Structure Dictionary Directory Brick Matrix NumMatrix Integer Float Number Complex Any native or object data type.


Returns true if the object is not a Pair or List and returns false if object is a pair.



Here are a number of links to Lambda coding examples which contain this instruction in various use cases.


Argument Types

Here are the links to the data types of the function arguments.

Character String Symbol Vector
BitVector ByteVector IntVector FltVector
ObjVector Structure Dictionary Brick
Directory ShortVector Matrix NumMatrix
Integer Float Number Complex
NumMatrix Pair List Boolean

Here are also a number of links to functions having arguments with any of these data types.

++ += + /=
/ *= * --
-= - abortTransaction abs
acos add1 addMethod addi
appendWriteln append apply argument
arithmetic asin associate atan
avg badd balance bcompareEQ
bcompareGE bcompareGT bcompareLE bcompareLT
bcompareNE bdiv beginTransaction binaryInsert
binaryNand binaryNor binaryNot binaryNxor
binarySearch bitToIntegerVector bitToNumberVector bitwiseAnd
bitwiseNand bitwiseNor bitwiseNot bitwiseNxor
bitwiseOr bitwiseShiftLeft bitwiseShiftRight bitwiseXor
bmod bmul boolean c::r
cadd car ccompareEQ ccompareGE
ccompareGT ccompareLE ccompareLT ccompareNE
cdiv cdr char character
checkPointTransaction class clean clear
closeLog cmod cmul code
commitTransaction compareEQ compareGE compareGT
compareLE compareLT compareNE compare
comparison compile complex compress
conjugate cons copy cos
cosh count csub date
day days360 debugBrowsableProcs debugDetective
debugEval debug decode defchild
defclass define(macro) defineStructure define
defmacro defmethod deforphan defriend
defstruct defun deg deleteRows
delete dimension disassemble display
divi downcase encode evalInSyncLocalContext
eval exit exp exportCsv
exportSbf exportTab expt fact
fdisplay fieldsOf fileClose fileCopy
fileDir fileDisplay fileEraseDir fileErase
fileExists fileMakeDir fileOpen fileReadAll
fileReadRecord fileRead fileResize fileSeek
fileSizeOf fileWriteAll fileWrite filewriteln
findBlock find floor fraction
freeBlock gc gcd getGlobalValue
getRecursionCount getSymbolTable getTickCount globalBinding
hashString hour iadd icompareEQ
icompareGE icompareGT icompareLE icompareLT
icompareNE idiv imaginary imod
importCsv importSbf importTab imul
insertRows insert inside inspect
integer isAtom isBitVector isBoolean
isBound isByteVector isCharAlphabetic isCharAlphanumeric
isCharLowercase isCharName isCharNumeric isCharUppercase
isCharWhitespace isChar isCharacter isClass
isComplex isDate isDictionary isDirectory
isEqual isError isEven isExact
isFloatVector isIdentical isImmediate isInexact
isInside isIntegerVector isInteger isLambda
isMatrix isMember isMoney isNegative
isNull isNumberMatrix isNumberVector isNumber
isObjectVector isObject isOdd isPair
isPcodeVector isPositive isString isStructure
isSymbol isText isTransaction isType
isVector isZero isub julian
kurtosis last lcm left
length lisp list loadModule
loadObject loadRepository loadWorkspace lock
log10 log2 logConsole log
logbase macroReplace makeDictionary makeGaussianMatrix
makeGramMatrix makeQuotedList makeQuotedSymbol makeStructure
map mapc matrixGaussianEliminate matrixGaussianSubstitute
max median member methodsOf
mid min minute mod
modi money month morph
muli nadd ncompareEQ ncompareGE
ncompareGT ncompareLE ncompareLT ncompareNE
ndiv new nmod nmul
now nsub number objectToDictionary
objectToDirectory objectToList objectToMatrix objectToNumMatrix
objectToNumVector objectToStructure objectToVector offset
onError openLog pair parent
parse pi pointer preAllocateFixedMemoryBlocks
product proplist proprecord putprop
qt quit quote rad
random randomize range rank
real refAttributes refValues ref
remProp remove rename replace
rept reset resize reverse
right round run saveImmediate
saveModule saveObject saveRepository saveWorkspace
second send setAttributes setBlock
setCar setCdr setLastCdr set
setf setq sigmoid sign
sin sinh sizeof skew
sleep sort sql sqrt
srandom stdev stdevp stringCiEQ
stringCiGE stringCiGT stringCiLE stringCiLT
stringCiNE stringFill stringToBVector stringToVector
string sub1 subi submit
substitute substringCiEQ substringCiGE substringCiGT
substringCiLE substringCiLT substringCiNE substringEQ
substringFill substringGE substringGT substringLE
substringLT substringNE substring sum
sumsqr super svmRegression symbolToTypeCode
symbol systemCheck system tan
tanh text time trim
type uncompress uniqueInsert unlock
upcase var varp vectorBinaryInnerProduct
vectorBipolarInnerProduct vectorCosineInnerProduct vectorCubeInnerProduct vectorDelete
vectorExpInnerProduct vectorFill vectorInnerProduct vectorLogInnerProduct
vectorQuartInnerProduct vectorQuintInnerProduct vectorSigmoidInnerProduct vectorSineInnerProduct
vectorSquareInnerProduct vectorTanInnerProduct vectorTanhInnerProduct version
writelg writeln year

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