From 3d92926a902017e7cf1f5738e99ff62da596ce12 Mon Sep 17 00:00:00 2001
From: Ethan Werner <mail@ethanwerner.com>
Date: Sun, 9 Aug 2026 15:02:21 +0400
Subject: refactor

---
 lib/ts.c | 93 +++++++++++++++++++++++++++++++---------------------------------
 1 file changed, 45 insertions(+), 48 deletions(-)

(limited to 'lib/ts.c')

diff --git a/lib/ts.c b/lib/ts.c
index 68e2f41..e035625 100755
--- a/lib/ts.c
+++ b/lib/ts.c
@@ -7,18 +7,19 @@
 
 fp_t * ts_fill( fp_t *x, uint_t n, fp_t x0, fp_t x1 )
 {
-	fp_t step = ( x1 - x0 ) / ( n - 1 );
+	if ( !x || n == 0 ) return x;
 
-	if( x0 == 0.0 && x1 == 0.0 )
+	fp_t step = n > 1 ? ( x1 - x0 ) / ( fp_t )( n - 1 ) : 0.0;
+
+	if( fabs( x0 ) < TS_FILL_ZERO_THRESHOLD && fabs( x1 ) < TS_FILL_ZERO_THRESHOLD )
 	{
-		memset(x, 0, sizeof( fp_t ) * n );
+		memset( x, 0, sizeof( fp_t ) * n );
 	}
-
 	else
 	{
 		for( uint_t i = 0; i < n; i++ )
 		{
-			x[i] = x0 + ( i * step );
+			x[i] = x0 + ( (fp_t)i * step );
 		}
 	}
 
@@ -26,42 +27,48 @@ fp_t * ts_fill( fp_t *x, uint_t n, fp_t x0, fp_t x1 )
 }
 
 
-void ts_print( fp_t *x, uint_t n )
+void ts_print( fp_t const *x, uint_t n, FILE *stream )
 {
-    fputc('[', stdout);
+	if ( !x || n == 0 ) return;
 
-    uint_t i;
-    for( i = 0; i < n - 1; i++ )
-    {
-        fprintf(stdout, "%f,", x[i]);
-    }
+	FILE *out = stream ? stream : stdout;
 
-    fprintf(stdout, "%f]", x[i]);
+	fputc( '[', out );
+
+	for ( uint_t i = 0; i < n - 1; i++ )
+	{
+		fprintf( out, "%f,", x[i] );
+	}
+
+	fprintf( out, "%f]", x[n - 1] );
 }
 
 
-void ts_pretty_print( fp_t const * const *x, uint_t m, uint_t n )
+void ts_pretty_print( fp_t const * const *x, uint_t m, uint_t n, FILE *stream )
 {
-    if( m > 1 )
-    {
-        for( uint_t i = 0; i < n; i++ )
-        {
-            uint_t j = 0;
-            for( ; j < m; j++ )
-            {
-                fprintf( stdout, "%f  ", x[i][j] );
-            }
-
-            fputs( "\n", stdout );
-        }
-    }
-    else
-    {
-        for( uint_t i = 0; i < n; i++ )
-        {
-            fprintf( stdout, "%f\n", x[0][i] );
-        }
-    }
+	if ( !x || m == 0 || n == 0 ) return;
+
+	FILE *out = stream ? stream : stdout;
+
+	if( m > 1 )
+	{
+		for( uint_t i = 0; i < n; i++ )
+		{
+			for( uint_t j = 0; j < m; j++ )
+			{
+				fprintf( out, "%f  ", x[j][i] );
+			}
+
+			fputs( "\n", out );
+		}
+	}
+	else
+	{
+		for( uint_t i = 0; i < n; i++ )
+		{
+			fprintf( out, "%f\n", x[0][i] );
+		}
+	}
 }
 
 
@@ -91,29 +98,19 @@ fp_t _ts_triangle_number( fp_t x )
 
 fp_t _ts_sum_to_covariance( fp_t sum_xy, fp_t sum_x, fp_t sum_y, uint_t k )
 {
+    if ( k == 0 ) return 0.0;
     return ( sum_xy - ( sum_x * sum_y / k ) ) / k;
 }
 
 
 fp_t _ts_sum_to_variance( fp_t sum_x2, fp_t sum_x, uint_t k )
 {
-    return _ts_sum_to_covariance( sum_x2, sum_x, sum_x, k );
+    return fmax( 0.0, _ts_sum_to_covariance( sum_x2, sum_x, sum_x, k ) );
 }
 
 
 uint_t _ts_circle_increment( uint_t i, uint_t k )
 {
+    if ( k == 0 ) return i;
     return ( i + 1 ) % k;
-}
-
-
-// ts_constant_t * ts_constant_init( uint_t n, ... )
-// {
-//     va_list args;
-//     va_start( args, n );
-
-//     for( uint_t i = 0; i < n; i++ )
-//     {
-
-//     }
-// }
\ No newline at end of file
+}
\ No newline at end of file
-- 
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