refactor: little change

data/tetests/spsolvex_test.txt

@@ -2,6 +2,6 @@ g1 = x1+3/3 * x2+ min(2,5)*x3 - 1;
 g2 = 1*3*x2 - 4*3;
 g3 = 1*3 * x2+sin(8-2)*x3 - 7;
 b = [0,0,0];
-r = sp_linsolvex([g1,g2,g3], b, [0,0,0], [x1,x2,x3]);
-r2 = sp_linsolvex([g1,g2,g3], [], [], [x1,x2,x3]);
+r = sp_linsolve([g1,g2,g3], b, [0,0,0], [x1,x2,x3]);
+r2 = sp_linsolve([g1,g2,g3], [], [], [x1,x2,x3]);
 return r-r2;
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