'vektorilaskut'
"function normi(v) {\n"
+"return Math.sqrt(v[0]**2+v[1]**2+v[2]**2);\n"
+"}\n\n"

+"function skaalaa(v,t) {\n"
+"var w=[];\n"
+"w.push(v[0]*t);\n"
+"w.push(v[1]*t);\n"
+"w.push(v[2]*t);\n"
+"return w;\n"
+"}\n\n"

+"function summa(u,v) {\n"
+"var w=[];\n"
+"w.push(u[0]+v[0]);\n"
+"w.push(u[1]+v[1]);\n"
+"w.push(u[1]+v[2]);\n"
+"return w;\n"
+"}\n\n"

+"function erotus(u,v) {\n"
+"return summa(u,skaalaa(v,-1));\n"
+"}\n\n"

+"function pituinen(v,t) {\n"
+"if (normi(v)<0.01) {\n"
+"return v;\n"
+"} else {\n"
+"var w=[];\n"
+"w.push(v[0]*t/normi(v));\n"
+"w.push(v[1]*t/normi(v));\n"
+"w.push(v[2]*t/normi(v));\n"
+"return w;\n"
+"}\n"
+"}\n\n"

+"function yksikko(v) {\n"
+"var w=[];\n"
+"w.push(v[0]/normi(v));\n"
+"w.push(v[1]/normi(v));\n"
+"w.push(v[2]/normi(v));\n"
+"return w;\n"
+"}\n\n"

+"function kohtisuora(v) {\n"
+"u=skaalaa(v,normi(v));\n"
+"if (Math.abs(u[0])<0.05) {\n"
+"w=[1,0,0];\n"
+"} else if (Math.abs(u[1])<0.05) {\n"
+"w=[0,1,0];\n"
+"} else {\n"
+"w=[u[1],-u[0],0];\n"
+"}\n"
+"return yksikko(w);\n"
+"}\n\n"

+"function ristitulo(u,v) {\n"
+"var w=[];\n"
+"w[0]=u[1]*v[2]-u[2]*v[1];\n"
+"w[1]=u[2]*v[0]-u[0]*v[2];\n"
+"w[2]=u[0]*v[1]-u[1]*v[0];\n"
+"return w;\n"
+"}\n\n";