A faster/nicer/smoother way to store x/y values when plotting to a graph

Hi guys,

I made a small application which plots some realtime data to a graph. For performance reasons I don't plot every point, but I collect the data and every 0.1s I send all collected data for each line using float arrays.
Unfortunately I'm not very used to all that stuff, so my first approach is rather humble...
Right now, in my class constructor define some float arrays with a fixed size:
                m_fX      = new float[25];
      m_fY1      = new float[25];
      m_fY2      = new float[25];
      m_fY3      = new float[25];
      m_fY4      = new float[25];
      m_fY5      = new float[25];
      m_fY6      = new float[25];
      m_fY7      = new float[25];
      m_fY8      = new float[25];
      m_fY9      = new float[25];
      m_fY10      = new float[25];

When the data comes in I fill the arrays and count the number of runs.
Every 0.1s all stored data has to be sent to the graph.

float* tempX = new float[m_iRuns];            // create temp X array, m_iRuns is the counter for the number of values stored in each array
float* tempY = new float[m_iRuns];            // create temp Y array

for (j=0; j<m_iRuns; j++)
     tempX[j] = m_fX[j];                            // copy X to new X array



for(int i = 0; i < m_iNumberOfGraphs; i++)
{
      switch(i)
            {
            case 0:
            {
                      for (j=0; j<m_iRuns; j++)
                  tempY[j] = m_fY1[j];      
                  plot(tempX, tempY);
            }
            break;
            case 1:
            {
                  for (j=0; j<m_iRuns; j++)
                        tempY[j] = m_fY2[j];      
                  plot(tempX, tempY);
            }
            break;
                 (....)
      }
// Clean up
delete[] tempX;
delete[] tempY;
tempX = NULL;
tempY = NULL;
m_iRuns = 0;     // reset counter

After that is done the counter is set back to 0 and the whole things starts again.

For a first approach/testing basic functionality that was asbolutely OK, wasn't much work etc. but I would like to avoid all that heavy copying... I think doing it in a smoother way would enhance performance etc.

Any suggestions?

Regards,

TE