first order GmC integrator in matlab script

Hi, I am implementing integrator with tf for ex tf=1/s+10.I know that in simulink it is easy to implement but I want to do it matlab code. So I am applying this tf to input signal with the help of filter function available in matlab like this "out=filter(tf,input_signal)"; my output should be integrated signal. But its behaving like low pass filter. Please correct me if I am doing wrong in applying integrator transfer function to input. Thank you in advance.