I/O routines

 template <class T> T SPreadKey(PHDU& primary, const string Keyname, 
       const T DefValue)

Read a keyword value from the primary header.

 template <class T> T SPreadKey(ExtHDU& ext, const string Keyname, 
       const T DefValue)

Read a keyword value from an extension header.

 template <class T> T SPreadKey(ExtHDU& ext, const string Keyname, 
       const Integer RowNumber, const T DefValue)

Read a keyword value which may be in a column for type II files.

 template <class T> void SPreadCol(ExtHDU& ext, const string ColName, 
       valarray<T>& Data)

Read a column into a valarray.

 template <class T> void SPreadCol(ExtHDU& ext, const string ColName, 
       vector<T>& Data)

Read a column into a vector.

 template <class T> void SPreadCol(ExtHDU& ext, const string ColName, 
       const Integer RowNumber, valarray<T>& Data)

Read a column from a Type II file into a valarray.

 template <class T> void SPreadCol(ExtHDU& ext, const string ColName, 
       const Integer RowNumber, vector<T>& Data)

Read a column from a Type II file into a vector.

 template <class T> void SPreadVectorCol(ExtHDU& ext, const string ColName, 
       vector<valarray<T> >& Data)

Read a vector column into a vector of valarrays.

 template <class T> void SPreadVectorCol(ExtHDU& ext, const string ColName, 
       vector<vector<T> >& Data)

Read a vector column into a vector of vectors.

 template <class T> void SPreadVectorColRow(ExtHDU& ext, const string ColName, 
       const Integer RowNumber, valarray<T>& Data)

Read a single row of a vector column into a valarray.

 template <class T> void SPreadVectorColRow(ExtHDU& ext, const string ColName, 
       const Integer RowNumber, vector<T>& Data)

Read a single row of a vector column into a vector.

```
 template <class T> void SPwriteKey(PHDU& primary, const string Keyname, 
       const T KeyValue, const string Comment)
```
Write a keyword to the primary header. This uses the CONTINUE convention if KeyValue is a string and longer than 68 characters.
```
 template <class T> void SPwriteKey(Table& primary, const string Keyname, 
       const T KeyValue, const string Comment)
```
Write a keyword to a table extension. This uses the CONTINUE convention if KeyValue is a string and longer than 68 characters.
```
 template <class T> void SPwriteCol(Table& table, const string ColName,
       const valarray<T>& Data, const bool forceCol = false)
```
Write a column from a valarray. If the data size is 1 or all values are the same then just write a keyword unless the forceCol bool is true.
```
 template <class T> void SPwriteCol(Table& table, const string ColName,
       const vector<T>& Data, const bool forceCol = false)
```
Write a column from a vector. If the data size is 1 or all values are the same then just write a keyword unless the forceCol bool is true.
```
 template <class T> void SPwriteVectorCol(Table& table, const string ColName,
       const vector<valarray<T> >& Data, const bool forceCol = false)
```
Write a column from a vector of valarrays. If the data size is 1 or all values are the same then just write a keyword unless the forceCol bool is true. If all values are the same within all valarrays then write a scalar column.
```
 template <class T> void SPwriteVectorCol(Table& table, const string ColName,
       const vector<vector<T> >& Data, const bool forceCol = false)
```
Write a column from a vector of vectors. If the data size is 1 or all values are the same then just write a keyword unless the forceCol bool is true. If all values are the same within all valarrays then write a scalar column.
```
 template <class T> bool SPneedCol(const T& Data, bool& isvector)
```
Check whether a column is required and if it needs to be a vector column. Note that T is assumed to be a valarray or vector of a valarray of some type.
```
 template <class T> bool SPneedCol(const T& Data)
```
Check whether a column is required. For this overloaded version T is assumed to be a valarray or vector of scalar of some type.
```
 vector<string> SPreadAllPrimaryKeywords(const string& filename)
```
Real all keywords from the primary extension into a vector of strings each of which is of format “KeyName = KeyValue”.
```
 vector<string> SPreadAllKeywords(const string&
  filename, const string& hduName,
       const int& hduNumber)
```
Real all keywords from an extension into a vector of strings each of which is of format “KeyName = KeyValue”.