
samer@2: \documentclass[10pt]{article}
samer@2: \usepackage{pldoc}
samer@2: \sloppy
samer@2: \makeindex
samer@2: 
samer@2: \begin{document}
samer@2: % This LaTeX document was generated using the LaTeX backend of PlDoc,
samer@2: % The SWI-Prolog documentation system
samer@2: 
samer@2: 
samer@2: 
samer@2: \section{plml: Prolog-Matlab interface}
samer@2: 
samer@2: \label{sec:plml}
samer@2: 
samer@2: \begin{tags}
samer@2:     \tag{To be done}
samer@2: Use mat(I) and tmp(I) as types to include engine Id.
samer@2: 
samer@2: Clarify relationship between return values and valid Matlab denotation.
samer@2: 
samer@2: Reshape/2 array representation: reshape([ ... ],Size)
samer@2: Expression language: arr(Vals,Shape,InnerFunctor) - allows efficient
samer@2: representation of arrays of arbitrary things. Will require more strict
samer@2: nested list form.
samer@2: 
samer@2: Deprecate old array(Vals::Type) and cell(Vals::Type) left-value syntax.
samer@2: 
samer@2: Remove I from \dcgref{ml_expr}{2} and add to mx type?
samer@2: \end{tags}
samer@2: 
samer@2: \paragraph{Types}
samer@2: 
samer@2: \textbf{ml_eng} - Any atom identifying a Matlab engine.
samer@2: 
samer@2: \textbf{ml_stmt} - A Matlab statement
samer@2: 
samer@2: \begin{code}
samer@2: X;Y     :: ml_stmt :-  X:ml_stmt, Y:ml_stmt.
samer@2: X,Y     :: ml_stmt :-  X:ml_stmt, Y:ml_stmt.
samer@2: X=Y     :: ml_stmt :-  X:ml_lval, Y:ml_expr.
samer@2: hide(X) :: ml_stmt :-  X:ml_stmt.
samer@2: \end{code}
samer@2: 
samer@2: \begin{code}
samer@2: ml_expr(A)       % A Matlab expression, possibly with multiple return values
samer@2: ml_loc ---> mat(atom,atom).  % Matbase locator
samer@2: \end{code}
samer@2: 
samer@2: \paragraph{Matlab expression syntax}
samer@2: 
samer@2: The Matlab expression syntax adopted by this module allows Prolog terms to represent
samer@2: or denote Matlab expressions. Let T be the domain of recognised Prolog terms (corresponding to
samer@2: the type ml_expr), and M be the domain of Matlab expressions written in Matlab syntax.
samer@2: Then V : T\Sifthen{}M is the valuation function which maps Prolog term X to Matlab expression V[X].
samer@2: These are some of the constructs it recognises:
samer@2: 
samer@2: Constructs valid only in top level statements, not subexpressions:
samer@2: 
samer@2: \begin{code}
samer@2: X;Y             % |--> V[X]; V[Y]  (sequential evaluation hiding first result)
samer@2: X,Y             % |--> V[X], V[Y]  (sequential evaluation displaying first result)
samer@2: X=Y             % |--> V[X]=V[Y] (assignment, X must denote a valid left-value)
samer@2: hide(X)         % |--> V[X]; (execute X but hide return value)
samer@2: \end{code}
samer@2: 
samer@2: Things that look and work like Matlab syntax (more or less):
samer@2: 
samer@2: \begin{code}
samer@2: +X              % |--> uplus(V[X])
samer@2: -X              % |--> uminus(V[X])
samer@2: X+Y             % |--> plus(V[X],V[Y])
samer@2: X-Y             % |--> minus(V[X],V[Y])
samer@2: X^Y             % |--> mpower(V[X],V[Y])
samer@2: X*Y             % |--> mtimes(V[X],V[Y])
samer@2: X/Y             % |--> mrdivide(V[X],V[Y])
samer@2: X\Y             % |--> mldivide(V[X],V[Y])
samer@2: X.^Y            % |--> power(V[X],V[Y])
samer@2: X.*Y            % |--> times(V[X],V[Y])
samer@2: X./Y            % |--> rdivide(V[X],V[Y])
samer@2: X.\Y            % |--> ldivide(V[X],V[Y])
samer@2: X:Y:Z           % |--> colon(V[X],V[Y],V[Z])
samer@2: X:Z             % |--> colon(V[X],V[Z])
samer@2: X>Z             % |--> gt(V[X],V[Y])
samer@2: X>=Z            % |--> ge(V[X],V[Y])
samer@2: X<Z             % |--> lt(V[X],V[Y])
samer@2: X=<Z            % |--> le(V[X],V[Y])
samer@2: X==Z            % |--> eq(V[X],V[Y])
samer@2: [X1,X2,...]     % |--> [ V[X1], V[X2], ... ]
samer@2: [X1;X2;...]     % |--> [ V[X1]; V[X2]; ... ]
samer@2: {X1,X2,...}     % |--> { V[X1], V[X2], ... }
samer@2: {X1;X2;...}     % |--> { V[X1]; V[X2]; ... }
samer@2: @X              % |--> @V[X] (function handle)
samer@2: \end{code}
samer@2: 
samer@2: Things that do not look like Matlab syntax but provide standard Matlab features:
samer@2: 
samer@2: \begin{code}
samer@2: 'Infinity'      % |--> inf (positive infinity)
samer@2: 'Nan'           % |--> nan (not a number)
samer@2: X``             % |--> ctranpose(V[X]) (conjugate transpose, V[X]')
samer@2: X#Y             % |--> getfield(V[X],V[q(Y)])
samer@2: X\\Y            % |--> @(V[X])V[Y] (same as lambda(X,Y))
samer@2: \\Y             % |--> @()V[Y] (same as thunk(Y))
samer@2: lambda(X,Y)     % |--> @(V[X])V[Y] (anonymous function with arguments X)
samer@2: thunk(Y)        % |--> @()V[Y] (anonymous function with no arguments)
samer@2: vector(X)       % |--> horzcat(V[X1],V[X2], ...)
samer@2: atvector(X)     % as vector but assumes elements of X are assumed all atomic
samer@2: cell(X)         % construct 1xN cell array from elements of X
samer@2: `X              % same as q(X)
samer@2: q(X)            % wrap V[X] in single quotes (escaping internal quotes)
samer@2: qq(X)           % wrap V[X] in double quotes (escaping internal double quotes)
samer@2: tq(X)           % wrap TeX expression in single quotes (escape internal quotes)
samer@2: \end{code}
samer@2: 
samer@2: Referencing different value representations.
samer@2: 
samer@2: \begin{code}
samer@2: mat(X,Y)           % denotes a value in the Matbase using a dbload expression
samer@2: mx(X:mx_blob)      % denotes an MX Matlab array in SWI memory
samer@2: ws(X:ws_blob)      % denotes a variable in a Matlab workspace
samer@2: wsseq(X:ws_blob)   % workspace variable containing list as cell array.
samer@2: \end{code}
samer@2: 
samer@2: Tricky bits.
samer@2: 
samer@2: \begin{code}
samer@2: apply(X,AX)        % X must denote a function or array, applied to list of arguments AX.
samer@2: cref(X,Y)          % cell dereference, |--> V[X]{ V[Y1], V[Y2], ... }
samer@2: arr(Lists)         % multidimensional array from nested lists.
samer@2: arr(Lists,Dims)    % multidimensional array from nested lists.
samer@2: \end{code}
samer@2: 
samer@2: Things to bypass default formatting
samer@2: 
samer@2: \begin{code}
samer@2: noeval(_)          % triggers a failure when processed
samer@2: atom(X)            % write atom X as write/1
samer@2: term(X)            % write term X as write/1
samer@2: \(P)               % escape and call phrase P directly to generate Matlab string
samer@2: $(X)               % calls pl2ml_hook/2, denotes V[Y] where plml_hook(X,Y).
samer@2: '$VAR'(N)          % gets formatted as p_N where N is assumed to be atomic.
samer@2: \end{code}
samer@2: 
samer@2: All other Prolog atoms are written using \predref{write}{1}, while other Prolog terms
samer@2: are assumed to be calls to Matlab functions named according to the head functor.
samer@2: Thus V[ $<$head$>$( $<$arg1$>$, $<$arg2$>$, ...) ] = $<$head$>$(V[$<$arg1$>$, V[$<$arg2$>$], ...).
samer@2: 
samer@2: There are some incompatibilities between Matlab syntax and Prolog syntax,
samer@2: that is, syntactic structures that Prolog cannot parse correctly:
samer@2: 
samer@2: \begin{itemize}
samer@2:     \item 'Command line' syntax, ie where a function of string arguments:
samer@2: "save('x','Y')" can be written as "save x Y" in Matlab,
samer@2: but in Prolog, you must use function call syntax with quoted arguments:
samer@2: save(`x,`'Y').
samer@2:     \item Matlab's postfix transpose operator "x'" must be written using a different
samer@2: posfix operator "x``" or function call syntax "ctranspose(x)".
samer@2:     \item Matlab cell referencing using braces, as in x\{1,2\} must be written
samer@2: as "cref(x,1,2)".
samer@2:     \item Field referencing using dot (.), eg x.thing - currently resolved
samer@2: by using hash (\#) operator, eg x\#thing.
samer@2:     \item Using variables as arrays and indexing them. The problem is that
samer@2: Prolog doesn't let you write a term with a variable as the head
samer@2: functor.
samer@2: \end{itemize}
samer@2: 
samer@2: \vspace{0.7cm}
samer@2: 
samer@2: \begin{description}
samer@2:     \predicate[nondet,multifile]{matlab_init}{2}{-Key, -Cmd:ml_expr}
samer@2: Each user-defined clause of \predref{matlab_init}{2} causes \arg{Cmd} to be executed
samer@2: whenever a new Matlab session is started.
samer@2: 
samer@2:     \predicate[nondet,multifile]{matlab_path}{2}{-Key, -Path:list(atom)}
samer@2: Each user-defined clause of \predref{matlab_path}{2} causes the directories in \arg{Path}
samer@2: to be added to the Matlab path of every new Matlab session. Directories
samer@2: are relative to the root directory as returned by Matlab function proot.
samer@2: 
samer@2:     \predicate[nondet,multifile]{pl2ml_hook}{2}{+X:term, -Y:ml_expr}
samer@2: Clauses of \predref{pl2ml_hook}{2} allow for extensions to the Matlab expression
samer@2: language such that \verb|V[$X] = V[Y]| if \verb$pl2ml_hook(X,Y)$.
samer@2: 
samer@2:     \predicate[det]{ml_open}{3}{+Id:ml_eng, +Host:atom, +Options:list(_)}
samer@2: \nodescription
samer@2:     \predicate[det]{ml_open}{2}{+Id:ml_eng, +Host:atom}
samer@2: \nodescription
samer@2:     \predicate[det]{ml_open}{1}{+Id:ml_eng}
samer@2: Start a Matlab session on the given host. If \arg{Host}=localhost
samer@2: or the name of the current current host as returned by \predref{hostname}{1},
samer@2: then a Matlab process is started directly. Otherwise, it is
samer@2: started remotely via SSH. \arg{Options} defaults to []. \arg{Host} defaults to
samer@2: localhost.
samer@2: 
samer@2: Start a Matlab session on the specified host using default options.
samer@2: If \arg{Host} is not given, it defaults to localhost. Session will be
samer@2: associated with the given \arg{Id}, which should be an atom. See \predref{ml_open}{3}.
samer@2: 
samer@2: Valid options are
samer@2: 
samer@2: \begin{description}
samer@2:     \termitem{noinit}{}
samer@2: If present, do not run initialisation commands specified by
samer@2: \predref{matlab_path}{2} and \predref{matlab_init}{2} clauses. Otherwise, do run them.
samer@2: \end{description}
samer@2: 
samer@2: \begin{description}
samer@2:     \termitem{debug}{In, Out}
samer@2: if present, Matlab is started in a script which captures standard
samer@2: input and output to files In and Out respectively.
samer@2: 
samer@2: [What if session is already open and attached to \arg{Id}?]
samer@2: \end{description}
samer@2: 
samer@2:     \predicate[det]{ml_close}{1}{+Id:ml_eng}
samer@2: Close Matlab session associated with \arg{Id}.
samer@2: 
samer@2:     \predicate[det]{ml_exec}{2}{+Id:ml_eng, +Expr:ml_expr}
samer@2: Execute Matlab expression without returning any values.
samer@2: 
samer@2:     \predicate[det]{ml_eval}{4}{+Id:ml_eng, +Expr:ml_expr, +Types:list(type), -Res:list(ml_val)}
samer@2: Evaluate Matlab expression binding return values to results list \arg{Res}. This new
samer@2: form uses an explicit output types list, so \arg{Res} can be completely unbound on entry
samer@2: even when multiple values are required.
samer@2: 
samer@2:     \predicate[semidet]{ml_test}{2}{+Id:ml_eng, +X:ml_expr(bool)}
samer@2: Succeeds if \arg{X} evaluates to true in Matlab session \arg{Id}.
samer@2: 
samer@2:     \predicate[det]{===}{2}{Y:ml_vals(A), X:ml_expr(A)}
samer@2: Evaluate Matlab expression \arg{X} as in \predref{ml_eval}{4}, binding one or more return values
samer@2: to \arg{Y}. If \arg{Y} is unbound or a single ml_val(_), only the first return value is bound.
samer@2: If \arg{Y} is a list, multiple return values are processed.
samer@2: 
samer@2:     \predicate[det]{??}{1}{X:ml_expr(_)}
samer@2: Execute Matlab expression \arg{X} as with \predref{ml_exec}{2}, without returning any values.
samer@2: 
samer@2:     \predicate[semidet]{???}{1}{X:ml_expr(bool)}
samer@2: Evaluate Matlab boolean expression \arg{X} as with \predref{ml_test}{2}.
samer@2: 
samer@2:     \predicate[det]{ml_debug}{1}{+Flag:boolean}
samer@2: Set or reset debug state. \verb$ml_debug(true)$ causes formatted Matlab
samer@2: statements to be printed before being sent to Matlab engine.
samer@2: 
samer@2:     \predicate[det]{term_mlstring}{3}{+Id:ml_eng, +X:ml_expr, -Y:list(code)}
samer@2: Convert term representing Matlab expression to a list of character codes.
samer@2: 
samer@2:     \predicate[det]{term_texatom}{2}{+X:tex_expr, -Y:atom}
samer@2: Convert term representing TeX expression to a string in atom form.
samer@2: 
samer@2:     \predicate[semidet]{wsvar}{3}{+X:ws_blob(A), -Nm:atom, -Id:ml_eng}
samer@2: True if \arg{X} is a workspace variable in Matlab session \arg{Id}.
samer@2: Unifies \arg{Nm} with the name of the Matlab variable.
samer@2: 
samer@2:     \predicate[det]{dropmat}{2}{+Id:ml_id, +Mat:ml_loc}
samer@2: Deleting MAT file from matbase.
samer@2: 
samer@2:     \predicate[det]{exportmat}{3}{+Id:ml_id, +Mat:ml_loc, +Dir:atom}
samer@2: Export specified MAT file from matbase to given directory.
samer@2: 
samer@2:     \predicate[nondet]{matbase_mat}{2}{+Id:ml_eng, -X:ml_loc}
samer@2: Listing mat files actually in matbase at given root directory.
samer@2: 
samer@2:     \predicate[det]{persist_item}{2}{+X:ml_expr(A), -Y:ml_expr(A)}
samer@2: Convert Matlab expression to persistent form not dependent on
samer@2: current Matlab workspace or MX arrays in Prolog memory space.
samer@2: Large values like arrays and structures are saved in the matbase
samer@2: replaced with matbase locators. Scalar values are converted to
samer@2: literal numeric values. Character strings are converted to Prolog atoms.
samer@2: Cell arrays wrapped in the \predref{wsseq}{1} functor are converted to literal
samer@2: form.
samer@2: 
samer@2: NB. any side effects are undone on backtracking -- in particular, any
samer@2: files created in the matbase are deleted.
samer@2: 
samer@2:     \predicate[det]{mhelp}{1}{+Name:atom}
samer@2: Lookup Matlab help on the given name. Equivalent to executing help(`X).
samer@2: 
samer@2:     \predicate[det]{compileoptions}{2}{+Opts:list(ml_options), -Prefs:ml_expr(options)}
samer@2: Convert list of option specifiers into a Matlab expression representing
samer@2: options (ie a struct). Each specifier can be a Name:Value pair, a name
samer@2: to be looked up in the \predref{optionset}{2} predicate, a nested list of ml_options
samer@2: compileoptions :: list (optionset \Sbar{} atom:value \Sbar{} struct) \Sifthen{} struct.
samer@2: NB. option types are as follows:
samer@2: 
samer@2: \begin{code}
samer@2: X :: ml_options :- optionset(X,_).
samer@2: X :: ml_options :- X :: ml_option(_).
samer@2: X :: ml_options :- X :: list(ml_options).
samer@2: X :: ml_options :- X :: ml_expr(struct(_)).
samer@2: 
samer@2: ml_option(A) ---> atom:ml_expr(A).
samer@2: \end{code}
samer@2: 
samer@2:     \predicate[det]{multiplot}{2}{+Type:ml_plot, +Cmds:list(ml_expr(_))}
samer@2: \nodescription
samer@2:     \predicate[det]{multiplot}{3}{+Type:ml_plot, +Cmds:list(ml_expr(_)), -Axes:list(ml_val(handle))}
samer@2: Executes plotting commands in \arg{Cmds} in multiple figures or axes as determined
samer@2: by \arg{Type}. Valid types are:
samer@2: 
samer@2: \begin{description}
samer@2:     \termitem{figs}{Range}
samer@2: Executes each plot in a separate figure, Range must be P..Q where P
samer@2: and Q are figure numbers.
samer@2:     \termitem{vertical}{}
samer@2: Executes each plot in a subplot;
samer@2: subplots are arranged vertically top to bottom in the current figure.
samer@2:     \termitem{horizontal}{}
samer@2: Executes each plot in a subplot;
samer@2: subplots are arranged horizontally left to right in the current figure.
samer@2:     \termitem{\Sdot}{Type, [link(Axis)]}
samer@2: As for multplot type \arg{Type}, but link X or Y axis scales as determined by Axis,
samer@2: which can be `x, `y, or `xy.
samer@2: \end{description}
samer@2: 
samer@2: Three argument form returns a list containing the Matlab handles to axes objects,
samer@2: one for each plot.
samer@2: 
samer@2:     \predicate[semidet,multifile]{optionset}{2}{+Key:term, -Opts:list(ml_options)}
samer@2: Extensible predicate for mapping arbitrary terms to a list of options
samer@2: to be processed by \predref{compileoptions}{2}.
samer@2: \end{description}
samer@2: 
samer@2: 
samer@2: \printindex
samer@2: \end{document}




