  There are many functions which are continuous everywhere but
non-differentiable at some or all points such functions are termed as
unreachable functions. Graphs representing such unreachable functions are
called unreachable graphs. For example, ECG is such an unreachable graph.
Classical calculus fails in their characterization as derivatives do not exist
at the unreachable points. Such unreachable functions can be characterized by
fractional calculus as fractional derivatives exist at those unreachable points
where classical derivatives do not exist. Definition of fractional derivatives
has been proposed by several mathematicians like Grunwald-Letinikov,
Riemann-Liouville, Caputo, and Jumarie to develop the theory of fractional
calculus. In this paper, we have used Jumarie type fractional derivative and
consequently the phase transition (P.T.) which is the difference between left
fractional derivative and right fractional derivatives to characterize those
points. A comparative study has been done between normal ECG sample and
problematic ECG sample (Right Ventricular Hypertrophy) by the help of the above
mentioned mathematical tool.
