c++ - invalid conversion from 'int' to int* [-fpermissive] -

previously had implemented , worked:

int *train_x = (int *)mxgetdata(in_a);// pointer 6th argument matrix train_x   (int = 0; < 6; i++) {     (int j = 0; j < 6; j++)     {         cout << train_x[6 * + j] << endl;     } }  int sizetrain_x1 = mxgetm(in_a); int sizetrain_x2 = mxgetn(in_a); 

i manage check if correct sizes following , good.

cout <<"training input numofcollum:\n"<< sizetrain_x1 << endl; cout << "training input numofrows:\n"<<sizetrain_x2 << endl; 

but when trying entire program following initialization compilation error:

for (int epoch = 0; epoch<training_epochs; epoch++) {     (int = 0; i<train_s; i++)     {         rbm.contrastive_divergence(train_x[i], learning_rate, k);     } } 

here error message:

rbm.cpp: in function ‘void mexfunction(int, mxarray**, int, const mxarray**)’: rbm.cpp:570:64: error: invalid conversion ‘int’ ‘int*’ [-fpermissive] rbm.cpp:81:6: error: initializing argument 1 of ‘void rbm::contrastive_divergence(int*, double, int)’ [-fpermissive] rbm.cpp:615:32: error: invalid types ‘int[int]’ array subscript

train_x int*. when train_x[i] int. contrastive_divergence() though wants int*. since cannot convert int int* getting subsequent error. either need pass address of train_x[i] &train_x[i] or pass train_x