Fixed typo

python/_fast_interp.pyx

@@ -11,22 +11,33 @@ __all__=["fast_interp"]
 
 @cython.boundscheck(False)
 @cython.cdivision(True)
-def fast_interp(npx.float64_t xmin, npx.float64_t dx, npx.float64_t[:] A, npx.float64_t[:] y, npx.float64_t[:] out, npx.float64_t beyond_val=npx.nan):
+def fast_interp(xmin0, dx0, A0, y0, out0, beyond_val=np.nan):
   cdef double rq, q
   cdef int iq
   cdef long i, Asize, ysize
-  cdef npx.float64_t[:] out0
+  cdef npx.float64_t xmin, dx
+  cdef npx.float64_t[:] out
+  cdef npx.float64_t[:] A, y
+  cdef npx.float64_t beyond
 
+  beyond=beyond_val
+  xmin = xmin0
+  dx = dx0
+  A = A0
+  y = y0
   ysize = y.size
-  out0 = out
+  out = out0
   Asize = A.size
 
+  if out.size != ysize:
+    raise ValueError("out and y must have the same size")
+
   with nogil:
     for i in prange(ysize):
       q = (y[i] - xmin) / dx
       iq = int(floor(q))
       rq = (q-iq)
       if iq+1 >= Asize or iq < 0:
-        out0[i] = beyond_val
+        out[i] = beyond
       else:
-        out0[i] = rq * A[iq+1] + (1-rq)*A[iq]
+        out[i] = rq * A[iq+1] + (1-rq)*A[iq]