error: (-5) in the case of classification problem the responses must be cate

气晕我~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
OpenCV3.0以后的hog+svm中，调用函数svm->train(data_mat, ROW_SAMPLE, res_mat);对样本进行训练时需要注意data_mat和res_mat的类型。
其中：data_mat必须是Mat类型，其数据类型为32位的浮点数CV_32FC1，其宽度为样本的个数，高度为HOG特征的维数；
res_mat必须是Mat类型，其数据类型为32位整数CV_32SC1，其宽度为样本的个数，高度为1。

        for (vector<float>::iterator iter = descriptors.begin(); iter != descriptors.end(); iter++){data_mat.at<float>(i, j) = descriptors[j];}res_mat.at<int>(i, 0) = img_catg[i];

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error: (-5) in the case of classification problem the responses must be cate

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