On 17/02/2016 1:05 p.m., Uwe Stöhr wrote:
Am 16.02.2016 um 10:37 schrieb Andrew Parsloe:
The math manual, section 19.3,...
Hi Andrew,
this is something for the lyx-docs list.
gives a method for numbering and
referencing subnumbered equations so that although the equations are
numbered, e.g., (1a), (1b), (1c), it is possible to reference them
collectively, e.g. as the equations (1) (without the a, b, c). The
method seems "messy".
I am confused because I wanted to show how to reference the equations
correctly, meaning as (1a), (1b), (1c). If you want to omit the
subnumbering you can do this but this won't be part of Math.lyx since
it is the idea of the subnumbering to get the a, b, c.
regards Uwe
Rather than try to explain things, I've attached two example documents
Uwe, one using ERT and one with a local layout that requires no ERT.
They show how to reference both a group of equations as a whole and the
subequations in the group. (These documents were written with your beta2
LyX on Windows 7.)
Andrew
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#LyX 2.2 created this file. For more info see http://www.lyx.org/
\lyxformat 506
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\end_header
\begin_body
\begin_layout Standard
Here is an example using ERT with a label inserted immediately after the
\series bold
\backslash
begin{subequations}
\series default
(it could also be inserted immediately before the
\series bold
\backslash
end{subequations}
\series default
), and labels inserted into the subequations, so that they too can be
referenced.
I've had to write the prefix
\begin_inset Quotes els
\end_inset
eq:
\begin_inset Quotes ers
\end_inset
explicitly for the first label.
\end_layout
\begin_layout Standard
This first example, i.e.
the equations (
\begin_inset CommandInset ref
LatexCommand ref
reference "eq:example-one"
\end_inset
), is a functional equation for
\begin_inset Formula $M$
\end_inset
and
\begin_inset Formula $m$
\end_inset
in terms of
\begin_inset Formula $\mathbf{U}$
\end_inset
and
\begin_inset Formula $\mathbf{u}$
\end_inset
respectively.
This becomes clear on substituting (
\begin_inset CommandInset ref
LatexCommand ref
reference "eq:second"
\end_inset
) into (
\begin_inset CommandInset ref
LatexCommand ref
reference "eq:first"
\end_inset
),
\begin_inset ERT
status open
\begin_layout Plain Layout
\backslash
begin{subequations}
\end_layout
\end_inset
\begin_inset CommandInset label
LatexCommand label
name "eq:example-one"
\end_inset
\begin_inset Formula
\begin{align}
M(\mathbf{U}) & =m(\mathbf{u})A+\sum_{j}u^{j}B_{j},\label{eq:first}\\
U^{i} & =m(\mathbf{u})C^{i}+\sum_{j}u^{j}D_{j}^{i},\label{eq:second}
\end{align}
\end_inset
\begin_inset ERT
status open
\begin_layout Plain Layout
\backslash
end{subequations}
\end_layout
\end_inset
where
\begin_inset Formula $\mathbf{U}=(U^{1},\ldots,U^{N})$
\end_inset
and
\begin_inset Formula $\mathbf{u}=(u^{1},\ldots,u^{N})$
\end_inset
.
\end_layout
\begin_layout Standard
When compiled to pdf (the example needs the
\family typewriter
amsmath
\family default
package) the two equations as a whole are referenced correctly, i.e.
(
\begin_inset CommandInset ref
LatexCommand ref
reference "eq:example-one"
\end_inset
) for the group as a whole, the equation number lacking the trailing
\begin_inset Quotes els
\end_inset
a
\begin_inset Quotes ers
\end_inset
or
\begin_inset Quotes els
\end_inset
b
\begin_inset Quotes ers
\end_inset
, and the individual equations are also referenced correctly, (
\begin_inset CommandInset ref
LatexCommand ref
reference "eq:first"
\end_inset
) and (
\begin_inset CommandInset ref
LatexCommand ref
reference "eq:second"
\end_inset
), where the equation numbers include the trailing letter.
\end_layout
\end_body
\end_document
#LyX 2.2 created this file. For more info see http://www.lyx.org/
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\end_header
\begin_body
\begin_layout Standard
Here is an example using a local layout for the
\family sans
subequation
\family default
environment that gets rid of all ERT.
Again there is a label for the environment which allows reference to the
equations as a whole, and labels for the individual equations allowing
reference to each separately.
As well as getting rid of ERT, the prefix
\begin_inset Quotes els
\end_inset
eq:
\begin_inset Quotes ers
\end_inset
is automatically included in the first label by the layout for the
\family sans
subequation
\family default
environment.
I've used a filled box to mark the end of the environment as it appears
in LyX.
It's not an ideal symbol; the label marks the beginning.
\end_layout
\begin_layout Standard
This first example, i.e.
the equations (
\begin_inset CommandInset ref
LatexCommand ref
reference "eq:example-one"
\end_inset
), is a functional equation for
\begin_inset Formula $M$
\end_inset
and
\begin_inset Formula $m$
\end_inset
in terms of
\begin_inset Formula $\mathbf{U}$
\end_inset
and
\begin_inset Formula $\mathbf{u}$
\end_inset
respectively.
This becomes clear on substituting (
\begin_inset CommandInset ref
LatexCommand ref
reference "eq:second"
\end_inset
) into (
\begin_inset CommandInset ref
LatexCommand ref
reference "eq:first"
\end_inset
),
\end_layout
\begin_layout Subequations
\begin_inset CommandInset label
LatexCommand label
name "eq:example-one"
\end_inset
\begin_inset Formula
\begin{align}
M(\mathbf{U}) & =m(\mathbf{u})A+\sum_{j}u^{j}B_{j},\label{eq:first}\\
U^{i} & =m(\mathbf{u})C^{i}+\sum_{j}u^{j}D_{j}^{i},\label{eq:second}
\end{align}
\end_inset
\end_layout
\begin_layout Standard
\noindent
where
\begin_inset Formula $\mathbf{U}=(U^{1},\ldots,U^{N})$
\end_inset
and
\begin_inset Formula $\mathbf{u}=(u^{1},\ldots,u^{N})$
\end_inset
.
\end_layout
\begin_layout Standard
When compiled to pdf (the example needs the
\family typewriter
amsmath
\family default
package) the two equations as a whole are referenced correctly, i.e.
(
\begin_inset CommandInset ref
LatexCommand ref
reference "eq:example-one"
\end_inset
) for the group as a whole, the equation number lacking the trailing
\begin_inset Quotes els
\end_inset
a
\begin_inset Quotes ers
\end_inset
or
\begin_inset Quotes els
\end_inset
b
\begin_inset Quotes ers
\end_inset
, and the individual equations are also referenced correctly, (
\begin_inset CommandInset ref
LatexCommand ref
reference "eq:first"
\end_inset
) and (
\begin_inset CommandInset ref
LatexCommand ref
reference "eq:second"
\end_inset
), where the equation numbers include the trailing letter.
\end_layout
\end_body
\end_document
