I plotted a graph from data I got from simulations, however the challenge I am having is that some data points are on the Y and X axis. I have tried using Log & semilogx but its giving me -ve values. I need +ve values. How can I resolve this pls?

 I plotted a graph from data I got from simulations, however the challenge I am having is that some  data points are on the Y and X axis. I have tried using Log scale & semilogx but its giving me -ve values. I am working on flow rates hence I need to have positive values for flow rates not negative.

Answer 1

[Dimitris Iliou]

Since you have data that I am assuming are expressed geometrically, you might have to use a logarithmic scale.

A negative value on the logarithmic scale does not mean that the value is negative.

For example,

log(0.001)

ans =

   -6.9078

Since you mentioned that you have data on (or close to) the X,Y axis, I think it is natural to encounter negative numbers since you would have to use a logarithmic scale.