I'm Sorry I Haven't a Clue in Salford was filmed and broadcast on BBC Four on 13 September 2008. Although some unaired pilots had previously been made, this was the first time ISIHAC has been shown on television. An extended version was released on DVD on 10 November 2008. The regular panellists decided to continue the annual stage tour despite Lyttelton's death, with Jack Dee (one of the 51st series' hosts) as chairman for the tour shows. Jeremy Hardy remained as the guest participant. Dates Another set of tour dates, with Jack Dee as chairman and Jeremy Hardy as guest panellist, took place in 2010. Dates
I-spline I-spline In the mathematical subfield of numerical analysis, an I-spline is a monotone spline function. A family of "I-spline" functions of degree "k" with "n" free parameters is defined in terms of the M-splines "M"("x"|"k", "t") where "L" is the lower limit of the domain of the splines. Since M-splines are non-negative, "I-splines" are monotonically non-decreasing. Let "j" be the index such that "t" ≤ "x" < "t". Then "I"("x"|"k", "t") is zero if "i" > "j", and equals one if "j" − "k" + 1 > "i". Otherwise, "I-splines" can be used as basis splines for regression analysis and