Plotting on Log graph

[danielmechanics]

Good Day,
I am plotting a semilog graph displayed on the front panel of my program.
The unit on the x-axis is in frequency(Hz) and the y-axis is in dBc/Hz
I wanted to program in such a way that the a straight line is plot between points at 10,100,1K,10K and 100KHz.That is to say I only need to key in 5 values.
My plot now jumps back to zero as all the values set to zero by default when i do not enter value into each array cell. I hope someone out there has solution to this.
Thank you.
Regards,
Daniel

[altenbach]

You probably want to use an xy-graph. This way you can graph arbitrarily spaced points.

(If you want to use a waveform graph, you must generate interpolated values for all intermediary array elements).