How to get CPU Utilization per transaction graph? or else what is the syntax to get CPU Util value in the Vuser script?

As per client request, I need to create CPU Utilization per transaction graph using the Loadrunner? Any body any idea about this?

I tried with following syntax to find the cpu_value but it is throwing error.
Presently I am Using Http/Https protocol.

Could you please some one correct me how to use the function for getting CPU Utilization Value at that point.

Thanks in advance,

measure_cpu ( );
cpu_val=cpu_check();
lr_user_data_point("cpu", cpu_val);