可能是你matlab版本太低，如果想用这个函数，上网下一个工具箱，或者安装更高级版本的matlab我的是2010a，可以查到SVMTRAIN trains a support vector machine classifier
SVMStruct = SVMTRAIN(TRAINING,GROUP) trains a support vector machine
classifier using data TRAINING taken from two groups given by GROUP.
SVMStruct contains information about the trained classifie
