*HI, I hope a mathematician or formula writer is reading this and assists to solve the problem. In order to replace P1 Im trying to define a complex number, but the only available variable (sp) is a two digit one, which does not generate complex images. (It does with Magnet!) I tried several solutions, using the first digit as real part and the second as imaginary: ; If (1<sp) d=(trunc(sp/10))/9 da=sp-100*d sp=d, da else sp=p1 endif ; It is eccepted but does not generate complex images. Using the mathematical definition the images are more interesting but not really complex: ; If (1<sp) d=(trunc(sp/10))/9 da=sp-100*d sp=d+sqr(-da) else sp=p1 endif ; This the image, (sp=32): https://www.dropbox.com/s/z2pfqj2q85xlvp6/64_LAMBD-22.GIF?dl=0 If I?m right the y-axis is the imaginary part.(??) ; Is there anything I can do to get really complex images like this: https://www.dropbox.com/s/2w9gn2jnpeqoo4o/63_LAMBD-19.GIF?dl=0 ; If Tim or Jim are reading this I?m certain to get the answer. ; Petta*