Paul Shannon <pshannon at="" systemsbiology.net=""> writes: > It looks as if some of the RBGL functions ('sp.between' for example) > depend > upon the old graph class, pre 1.10, in which edge weights were > an obligatory attribute. Please tell us sessionInfo() so we know which RBGL and which graph you are using. > sp.between (g, 'F', 'L') > Error in if (any(eWW[eWW < 0])) stop("sp.between requies that all > edge weights are nonnegative") : > missing value where TRUE/FALSE needed > > > sp.between <- function (g, start, finish) > { > ... > eW = edgeWeights(g) > eWW <- unlist(eW) > if (any(eWW[eWW < 0])) > stop("sp.between requies that all edge weights are nonnegative") > > > Is there any plan to accommodate the new 'weightless' graph class > design? > Or is there any workaround anybody can suggest? Certainly there could be an issue yet to solve, but this did get some testing and "should" work :-) In other words, edgeWeights will return an appropriate structure defaulting to all 1's if no edge attribute named "weight" has been defined. If such an edge attribute _has_ been defined, then it's values will be used to contruct an appropriate list in the edgeWeights call. For your graph g, what does edgeDataDefaults(g) say? + seth