Bill Allombert on Sun, 13 Nov 2005 11:50:56 +0100 |
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Re: Little problems |
On Sat, Nov 12, 2005 at 11:35:44PM +0100, Martin Larsen wrote: > First this: > >acos(cos(I)) > *** acos: bug in GP (Segmentation Fault), please report Apparently, you are using PARI/GP 2.2.9. This bug was not present in previous releases and was fixed in PARI/GP 2.2.10. I would suggest you to upgrade to PARI/GP 2.2.11. > Then this: > > >a=matid(8); > > Now I will try to generate a matrix recursively. > Only s[1,] is importent at start. I suppose you mean a[1,] ? > It's repeated 3 times make the error clear. > 3. time is correct. If I do the same thing with > 2 for-loops the correct result is there 1. time. > > >matrix(6,6,i,j,a[i+1,j+1]=a[i,j]+3*a[i,j+1]+2*a[i,j+2]) In case it is not clear: what you do is equivalent to for(i=1,6,for(j=1,6,a[i+1,j+1]=a[i,j]+3*a[i,j+1]+2*a[i,j+2])); matrix(6,6,i,j,a[i+1,j+1]) You are modifying the matrix 'a' each time, so you will not get the same result unless you reset 'a' with a=matid(8); > I suppose it is a bug in Pari (?) It is not a bug: you are changing the matrix a. > Another thing: if I do this (it's only working with the letter 'i') > 5^i , then my inputline look like this > : > (could I have this explained). Are you using the Windows version ? Maybe the system translated ^i to î, or something. It might be related to bug #102, see <http://pari.math.u-bordeaux.fr/Bugs/102> Or maybe I completly misunderstood you. Cheers, Bill.