Experimental Physics and
Industrial Control System

       I am plotting a graph between current and voltage.Here User set the current and read a corresponding voltage from device upto 20 times.Here we are reading one value of current and its corresponding voltage and transfer this value into waveform record.Here I am taking two waveform records one for current and another for voltage.The value is stored on 0th index of waveform.In the next iteration change the value of current and again send to waveform then again value is putting on 0th index but I want to put on 1st index then in next iteration ,put on 2nd index of waveform.How to previous values stored in array?

2. Now the problem is occurring ,in case of plot always I get one point and previous did not store. I want to store all values and draw the graph from point 1 to 20.

           

      How to solve this problem?please provide me solution of this problem...

                                 Thanks in advance...