1、length函式：計算向量或矩陣的長度
2、用法說明
y = length(x) 函式計算指定向量或矩陣的長度y。如果引數變數x是向量，則返回其長度；如果引數變數是非空矩陣，則length(x)與max(size(x))等價
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
>> 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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