Before revision:  We begin with a  simple continuous model of news impact and then perform its discretization, adjusting it to dealing with discontinuous functions . Stock chartsare the main examples for us ;
After revision:  We begin with a simple continuous model of news impact on share-prices. In spite of its simplicity, it describes well the power growth of share-prices, periodicity, logarithmic periodicity, and the market phenomena like using price targets and profit-taking; Bessel and hypergeometric functions are used. Its discretization is performed, adjusted to discontinuous functions and aimed at stock charts, the main examples for us ;