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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 lengthMatlab基本函式
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