Can anyone help with classification with HOG descriptor using SVM in Matlab?

I want to do classification in matlab using SVM. For the feature, I'm using HOG feature descriptor.

I have train the model called "trainedClassifier.mat".

The question is how to evaluate the SVM, like how to get the results using SVM. I am trying my model on a single image. Can some one guide me how to evaluate my model on a single image so that it show me the results. Here is the code:

% Read image.

img = imread('BS_Images/bag/1.jpg');

%Get HOG features

H = HOG(img);

% Load the pre-trained model.

load('trainedClassifier.mat');

% Display the image

hold off;

colormap gray;

imagesc(img)

I shall be very thankful for the kind act of consideration.