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1、length函数：计算向量或矩阵的长度
2、用法说明
y = length(x) 函数计算指定向量或矩阵的长度y。如果参数变量x是向量，则返回其长度；如果参数变量是非空矩阵，则length(x)与max(size(x))等价
3、举例说明
>> 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 = 64、附录
>> 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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