DOC: update header related docs for new Function changes

docs/user/function.rst

@@ -120,7 +120,7 @@ Having the csv file, we can define a ``Function`` object with it:
     print(f.source)
 
 .. note::
-    A header in the csv file is optional, but if present must be in a string like format, i.e. beginning and ending with quotation marks.
+    A single header line in the csv file is optional.
 
 b. Function Map
 ~~~~~~~~~~~~~~~

docs/user/motors/thrust.rst

@@ -52,7 +52,7 @@ specify a directory containing a .csv file.
 .. note::
 
         The first column of the .csv file must be time in seconds and the second 
-        column must be thrust in Newtons. The file must contain no headers.
+        column must be thrust in Newtons. The file can contain a single line header.
 
 That can be done as follows:
 

docs/user/rocket.rst

@@ -96,8 +96,8 @@ Here is an example of a drag curve file:
     0.9, 0.45696342
     1.0, 0.62744566
 
-.. important::
-    The CSV file must have **no headers**.
+.. note::
+    The CSV file can contain a single line header.
 
 .. tip::
     Getting a drag curve can be a challenging task. To get really accurate

rocketpy/motors/hybrid_motor.py

@@ -214,10 +214,10 @@ def __init__(
             also be given as a callable function, whose argument is time in
             seconds and returns the thrust supplied by the motor in the
             instant. If a string is given, it must point to a .csv or .eng file.
-            The .csv file shall contain no headers and the first column must
-            specify time in seconds, while the second column specifies thrust.
-            Arrays may also be specified, following rules set by the class
-            Function. Thrust units are Newtons.
+            The .csv file can contain a single line header and the first column
+            must specify time in seconds, while the second column specifies
+            thrust. Arrays may also be specified, following rules set by the
+            class Function. Thrust units are Newtons.
 
             .. seealso:: :doc:`Thrust Source Details </user/motors/thrust>`
         dry_mass : int, float

rocketpy/motors/liquid_motor.py

@@ -175,10 +175,10 @@ def __init__(
             also be given as a callable function, whose argument is time in
             seconds and returns the thrust supplied by the motor in the
             instant. If a string is given, it must point to a .csv or .eng file.
-            The .csv file shall contain no headers and the first column must
-            specify time in seconds, while the second column specifies thrust.
-            Arrays may also be specified, following rules set by the class
-            Function. Thrust units are Newtons.
+            The .csv file can contain a single line header and the first column
+            must specify time in seconds, while the second column specifies
+            thrust. Arrays may also be specified, following rules set by the
+            class Function. Thrust units are Newtons.
 
             .. seealso:: :doc:`Thrust Source Details </user/motors/thrust>`
         dry_mass : int, float

rocketpy/motors/motor.py

@@ -174,10 +174,10 @@ def __init__(
             also be given as a callable function, whose argument is time in
             seconds and returns the thrust supplied by the motor in the
             instant. If a string is given, it must point to a .csv or .eng file.
-            The .csv file shall contain no headers and the first column must
-            specify time in seconds, while the second column specifies thrust.
-            Arrays may also be specified, following rules set by the class
-            Function. Thrust units are Newtons.
+            The .csv file can contain a single line header and the first column
+            must specify time in seconds, while the second column specifies
+            thrust. Arrays may also be specified, following rules set by the
+            class Function. Thrust units are Newtons.
 
             .. seealso:: :doc:`Thrust Source Details </user/motors/thrust>`
 
@@ -1092,7 +1092,7 @@ def __init__(
             also be given as a callable function, whose argument is time in
             seconds and returns the thrust supplied by the motor in the
             instant. If a string is given, it must point to a .csv or .eng file.
-            The .csv file shall contain no headers and the first column must
+            The .csv file can contain a single line header and the first column must
             specify time in seconds, while the second column specifies thrust.
             Arrays may also be specified, following rules set by the class
             Function. Thrust units are Newtons.

rocketpy/motors/solid_motor.py

@@ -216,10 +216,10 @@ def __init__(
             also be given as a callable function, whose argument is time in
             seconds and returns the thrust supplied by the motor in the
             instant. If a string is given, it must point to a .csv or .eng file.
-            The .csv file shall contain no headers and the first column must
-            specify time in seconds, while the second column specifies thrust.
-            Arrays may also be specified, following rules set by the class
-            Function. Thrust units are Newtons.
+            The .csv file can contain a single line header and the first column
+            must specify time in seconds, while the second column specifies 
+            thrust. Arrays may also be specified, following rules set by the
+            class Function. Thrust units are Newtons.
 
             .. seealso:: :doc:`Thrust Source Details </user/motors/thrust>`
         nozzle_radius : int, float

rocketpy/rocket/aero_surface.py

@@ -629,8 +629,8 @@ def __init__(
             Otherwise, if tuple, fins will be considered as airfoils. The
             tuple's first item specifies the airfoil's lift coefficient
             by angle of attack and must be either a .csv, .txt, ndarray
-            or callable. The .csv and .txt files must contain no headers
-            and the first column must specify the angle of attack, while
+            or callable. The .csv and .txt files can contain a single line 
+            header and the first column must specify the angle of attack, while
             the second column must specify the lift coefficient. The
             ndarray should be as [(x0, y0), (x1, y1), (x2, y2), ...]
             where x0 is the angle of attack and y0 is the lift coefficient.
@@ -1037,8 +1037,8 @@ def __init__(
             Otherwise, if tuple, fins will be considered as airfoils. The
             tuple's first item specifies the airfoil's lift coefficient
             by angle of attack and must be either a .csv, .txt, ndarray
-            or callable. The .csv and .txt files must contain no headers
-            and the first column must specify the angle of attack, while
+            or callable. The .csv and .txt files can contain a single line 
+            header and the first column must specify the angle of attack, while
             the second column must specify the lift coefficient. The
             ndarray should be as [(x0, y0), (x1, y1), (x2, y2), ...]
             where x0 is the angle of attack and y0 is the lift coefficient.
@@ -1379,8 +1379,8 @@ def __init__(
             Otherwise, if tuple, fins will be considered as airfoils. The
             tuple's first item specifies the airfoil's lift coefficient
             by angle of attack and must be either a .csv, .txt, ndarray
-            or callable. The .csv and .txt files must contain no headers
-            and the first column must specify the angle of attack, while
+            or callable. The .csv and .txt files can contain a single line 
+            header and the first column must specify the angle of attack, while
             the second column must specify the lift coefficient. The
             ndarray should be as [(x0, y0), (x1, y1), (x2, y2), ...]
             where x0 is the angle of attack and y0 is the lift coefficient.

rocketpy/rocket/rocket.py

@@ -955,8 +955,8 @@ def add_trapezoidal_fins(
             Otherwise, if tuple, fins will be considered as airfoils. The
             tuple's first item specifies the airfoil's lift coefficient
             by angle of attack and must be either a .csv, .txt, ndarray
-            or callable. The .csv and .txt files must contain no headers
-            and the first column must specify the angle of attack, while
+            or callable. The .csv and .txt files can contain a single line
+            header and the first column must specify the angle of attack, while
             the second column must specify the lift coefficient. The
             ndarray should be as [(x0, y0), (x1, y1), (x2, y2), ...]
             where x0 is the angle of attack and y0 is the lift coefficient.
@@ -1036,8 +1036,8 @@ def add_elliptical_fins(
             Otherwise, if tuple, fins will be considered as airfoils. The
             tuple's first item specifies the airfoil's lift coefficient
             by angle of attack and must be either a .csv, .txt, ndarray
-            or callable. The .csv and .txt files must contain no headers
-            and the first column must specify the angle of attack, while
+            or callable. The .csv and .txt files can contain a single line
+            header and the first column must specify the angle of attack, while
             the second column must specify the lift coefficient. The
             ndarray should be as [(x0, y0), (x1, y1), (x2, y2), ...]
             where x0 is the angle of attack and y0 is the lift coefficient.