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Scilab manual >> Scilab > Scilab keywords > empty

empty

([]) 空行列

説明

[] は空行列を定義します. この行列は特殊な行列として定義され, 0行0列,すなわちsize([]) =[0,0]となります. 以下の便利な表記が使用可能です:

[] * A = A * [] = []

[] + A = A + [] = A

[ [], A] = [A, []] = A inv([]) =[]

det([])=cond([])=rcond([])=1, rank([])=0

明示的な答えがない場合,行列関数は [] またはエラーメッセージを 返します. 空の線形システム (syslin リスト) は複数の行または列を有する可能性があります.

例s

s=poly(0,'s'); A = [s, s+1]; 
A+[], A*[]
A=rand(2,2); AA=A([],1), size(AA)
svd([])
w=ssrand(2,2,2); wr=[]*w; size(wr), w1=ss2tf(wr), size(w1)
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Last updated:
Wed Jan 26 16:25:00 CET 2011