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author | Volker Lendecke <vl@samba.org> | 2008-09-19 08:01:23 +0200 |
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committer | Volker Lendecke <vl@samba.org> | 2008-12-17 12:57:18 +0100 |
commit | 390f19b649b85a8f8ab762c6a4e9d1a3d23d3f47 (patch) | |
tree | 9f9506e36222640d23b086d62b32de940c526a98 /source3/lua-5.1.4/test/bisect.lua | |
parent | 081f8883bafc11ca7c08f868ec19f1ea32071837 (diff) | |
download | samba-390f19b649b85a8f8ab762c6a4e9d1a3d23d3f47.tar.gz samba-390f19b649b85a8f8ab762c6a4e9d1a3d23d3f47.tar.bz2 samba-390f19b649b85a8f8ab762c6a4e9d1a3d23d3f47.zip |
Add the Lua distibution from http://www.lua.org/ftp/lua-5.1.4.tar.gz
Available under the MIT license.
Adding it to see how the build farm likes it. They claim to be 100% pure
ANSI C and compile everywhere. Lets see. If it breaks badly, we can remove
it again.
Diffstat (limited to 'source3/lua-5.1.4/test/bisect.lua')
-rw-r--r-- | source3/lua-5.1.4/test/bisect.lua | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/source3/lua-5.1.4/test/bisect.lua b/source3/lua-5.1.4/test/bisect.lua new file mode 100644 index 0000000000..f91e69bfba --- /dev/null +++ b/source3/lua-5.1.4/test/bisect.lua @@ -0,0 +1,27 @@ +-- bisection method for solving non-linear equations + +delta=1e-6 -- tolerance + +function bisect(f,a,b,fa,fb) + local c=(a+b)/2 + io.write(n," c=",c," a=",a," b=",b,"\n") + if c==a or c==b or math.abs(a-b)<delta then return c,b-a end + n=n+1 + local fc=f(c) + if fa*fc<0 then return bisect(f,a,c,fa,fc) else return bisect(f,c,b,fc,fb) end +end + +-- find root of f in the inverval [a,b]. needs f(a)*f(b)<0 +function solve(f,a,b) + n=0 + local z,e=bisect(f,a,b,f(a),f(b)) + io.write(string.format("after %d steps, root is %.17g with error %.1e, f=%.1e\n",n,z,e,f(z))) +end + +-- our function +function f(x) + return x*x*x-x-1 +end + +-- find zero in [1,2] +solve(f,1,2) |