1、length函數(shù)：計(jì)算向量或矩陣的長度

2、用法說明

y = length(x) 函數(shù)計(jì)算指定向量或矩陣的長度y。如果參數(shù)變量x是向量，則返回其長度；如果參數(shù)變量是非空矩陣，則length(x)與max(size(x))等價(jià)

3、舉例說明>> x = 'youhaidong'

x =

youhaidong

>> y = length(x)

y =

10

>> x = rand(6,6)

x =

0.8147 0.2785 0.9572 0.7922 0.6787 0.7060

0.9058 0.5469 0.4854 0.9595 0.7577 0.0318

0.1270 0.9575 0.8003 0.6557 0.7431 0.2769

0.9134 0.9649 0.1419 0.0357 0.3922 0.0462

0.6324 0.1576 0.4218 0.8491 0.6555 0.0971

0.0975 0.9706 0.9157 0.9340 0.1712 0.8235

>> y = length(x)

y =

6

4、附錄>> help length

length Length of vector.

length(X) returns the length of vector X. It is equivalent

to MAX(SIZE(X)) for non-empty arrays and 0 for empty ones.

See also numel.

Overloaded methods:

timer/length

serial/length

daqdevice/length

daqchild/length

distributed/length

codistributed/length

Composite/length

gpuArray/length

fints/length

videosource/length

videoinput/length

visa/length

udp/length

tcpip/length

icgroup/length

icdevice/length

i2c/length

gpib/length

Bluetooth/length

xregpointer/length

mbcstore/length

guidarray/length

cgrules/length

designdev/length

des_constraints/length

coninputfactor/length

xregcontainer/length

xregmulti/length

xregcovariance/length

xregmonitorplotproperties/length

xregdataset/length

cgtradeoffkeytable/length

dataset/length

categorical/length

tscollection/length

Reference page in Help browser

doc length

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