mirror of https://github.com/texmacs/doc.git
105 lines
7.1 KiB
Tcl
105 lines
7.1 KiB
Tcl
<TeXmacs|1.0.7.14>
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<style|tmdoc>
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<\body>
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<tmdoc-title|Spreadsheets>
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<TeXmacs> provides rudimentary spreadsheet-like facilities with the
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advantage that the computations can be carried out using any of the
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plug-ins that can be used as a scripting language. In order to use the
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spreadsheet facilities, you should therefore start with the selection of a
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scripting language in the menu <menu|Document|Scripts>.
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As soon as you have selecting a scripting language, such as <name|Maxima>,
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then you may enter a new spreadsheet using <menu|Insert|Table|Textual
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spreadsheet> or <menu|Insert|Table|Numeric spreadsheet>. You may edit the
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spreadsheet as an ordinary table, except that the <key|return> key will
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attempt to reevaluate the cells of the table.
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In addition, when preceding the contents of a cell by =, then cell will be
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considered as an input-output switch. More precisely, the input is a
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formula which will be evaluated using the current scripting language. After
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the evaluation, only the result of the evaluation is shown in the cell.
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After pressing <key|return> a second time in the cell, it will be possible
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switch back and edit the input. In the formulas, one may refer to the
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others using names such as <samp|c5> for the third row and the fifth
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column.
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<\example>
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On the left-hand side of the figure below, we have displayed a simple
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table with formulas for evaluating the sums of the first two items of
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each row. On the right-hand side, we have shown the result after
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evaluation.
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<\big-figure|<small|<with|prog-scripts|maxima|<calc-table|simple1|<numeric-dot-table|<tformat|<cwith|1|-1|1|-1|cell-width|5em>|<cwith|1|-1|1|-1|cell-hmode|max>|<table|<row|<cell|<cell-inert|a1|1>>|<cell|<cell-inert|a2|10>>|<cell|<cell-inert|a3|=a1+a2>>>|<row|<cell|<cell-inert|b1|100>>|<cell|<cell-inert|b2|1000>>|<cell|<cell-inert|b3|=b1+b2>>>>>>><space|2em><calc-table|simple2|<numeric-dot-table|<tformat|<cwith|1|-1|1|-1|cell-width|5em>|<cwith|1|-1|1|-1|cell-hmode|max>|<table|<row|<cell|<cell-inert|a1|1>>|<cell|<cell-inert|a2|10>>|<cell|<cell-output|a3|=a1+a2|<math|11>>>>|<row|<cell|<cell-inert|b1|100>>|<cell|<cell-inert|b2|1000>>|<cell|<cell-output|b3|=b1+b2|<math|1100>>>>>>>>>>>
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Evaluation of a simple spreadsheet.
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</big-figure>
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</example>
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<\example>
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The cells may contain mathematical formulas and the spreadsheet may take
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advantage of any of the capacities of the scripting language. For
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instance, the figure below demonstrates another possible use of
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<name|Maxima>.
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<\big-figure|<small|<with|prog-scripts|maxima|<calc-table|derivatives1|<textual-table|<tformat|<cwith|1|-1|1|1|cell-width|15em>|<cwith|1|-1|1|1|cell-hmode|max>|<table|<row|<cell|<cell-inert|a1|<math|sin<around*|(|x<rsup|2>|)>>>>>|<row|<cell|<cell-inert|b1|=diff(a1,x)>>>|<row|<cell|<cell-inert|c1|=diff(b1,x)>>>|<row|<cell|<cell-inert|d1|=diff(c1,x)>>>>>>><space|2em><calc-table|derivatives2|<textual-table|<tformat|<cwith|1|-1|1|1|cell-width|15em>|<cwith|1|-1|1|1|cell-hmode|max>|<table|<row|<cell|<cell-inert|a1|<math|sin<around*|(|x<rsup|2>|)>>>>>|<row|<cell|<cell-output|b1|=diff(a1,x)|<math|2*x*cos
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<around*|(|x<rsup|2>|)>>>>>|<row|<cell|<cell-output|c1|=diff(b1,x)|<math|2*cos
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<around*|(|x<rsup|2>|)>-4*x<rsup|2>*sin
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<around*|(|x<rsup|2>|)>>>>>|<row|<cell|<cell-output|d1|=diff(c1,x)|<math|-12*x*sin
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<around*|(|x<rsup|2>|)>-8*x<rsup|3>*cos
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<around*|(|x<rsup|2>|)>>>>>>>>>>>>
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Computation of successive derivatives using <name|Maxima>.
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</big-figure>
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</example>
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<TeXmacs> supports a few special notations for applying operations on all
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cells in a subtable. For instance, as in <name|Excel>, one may use the
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notation <samp|c3:d5> for indicating all cells <samp|c3>, <samp|c4>,
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<samp|c5>, <samp|d3>, <samp|d4>, <samp|d5> in the block from <samp|c3> to
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<samp|d5>. An alternative notation <cell-commas> for <samp|:> can be
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entered by typing <key|, ,>. In a similar way, one may enter the special
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notation <cell-plusses> by typing <key|+ +>. For instance,
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<samp|c3<cell-plusses>d5> stands for the sum of all cells between <samp|c3>
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and <samp|d5>.
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<\example>
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The figure below shows an example on how to use taking sums of cells.
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Notice that empty cells count for zero.
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<\big-figure|<small|<with|prog-scripts|maxima|<calc-table|sum1|<numeric-dot-table|<tformat|<cwith|1|-1|1|-1|cell-width|5em>|<cwith|1|-1|1|-1|cell-hmode|max>|<table|<row|<cell|<cell-inert|a1|15.10>>|<cell|<cell-inert|a2|15.10>>|<cell|<cell-inert|a3|30.20>>>|<row|<cell|<cell-inert|b1|100>>|<cell|<cell-inert|b2|125>>|<cell|<cell-inert|b3|75>>>|<row|<cell|<cell-inert|c1|28.50>>|<cell|<cell-inert|c2|>>|<cell|<cell-inert|c3|14.25>>>|<row|<cell|<cell-inert|d1|12>>|<cell|<cell-inert|d2|16>>|<cell|<cell-inert|d3|20>>>|<row|<cell|<cell-inert|e1|=a1<cell-plusses>d1>>|<cell|<cell-inert|e2|=a2<cell-plusses>d2>>|<cell|<cell-inert|e3|=a3<cell-plusses>c3>>>>>>><space|2em><calc-table|sum2|<numeric-dot-table|<tformat|<cwith|1|-1|1|-1|cell-width|5em>|<cwith|1|-1|1|-1|cell-hmode|max>|<cwith|5|5|1|3|cell-width|5em>|<cwith|5|5|1|3|cell-hmode|max>|<table|<row|<cell|<cell-inert|a1|15.10>>|<cell|<cell-inert|a2|15.10>>|<cell|<cell-inert|a3|30.20>>>|<row|<cell|<cell-inert|b1|100>>|<cell|<cell-inert|b2|125>>|<cell|<cell-inert|b3|75>>>|<row|<cell|<cell-inert|c1|28.50>>|<cell|<cell-inert|c2|>>|<cell|<cell-inert|c3|14.25>>>|<row|<cell|<cell-inert|d1|12>>|<cell|<cell-inert|d2|16>>|<cell|<cell-inert|d3|20>>>|<row|<cell|<cell-output|e1|=a1<cell-plusses>d1|<math|155.6>>>|<cell|<cell-output|e2|=a2<cell-plusses>d2|<math|156.1>>>|<cell|<cell-output|e3|=a3<cell-plusses>c3|<math|119.45>>>>>>>>>>>
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Evaluation of a simple spreadsheet.
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</big-figure>
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</example>
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Notice that copying and pasting of subtables works in the same way as for
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ordinary tables, with the additional features that the names of the cells
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and references to cells in the formulas are renumbered automatically.
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Similarly, automatic renumbering is used when inserting new columns or
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rows, or when removing existing columns or rows.
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We also notice that field references can be used inside spreadsheet cells
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in order to refer to some computational markup outside the table.
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Inversely, each spreadsheet also carries an invisible <samp|Ref> field
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which can be edited by deactivating the spreadsheet or from the focus bar
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(when selecting the entire spreadsheet). The <samp|Ref> field of the
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spreadsheet is used as a prefix for refering to the contents of cells
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outside the table or from within other spreadsheets. For instance, if
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<samp|Ref> equals <samp|sheet>, then <samp|sheet-c4> will refer to the
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field <samp|c4> inside the spreadsheet.
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<tmdoc-copyright|2012|Joris van der Hoeven>
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<tmdoc-license|Permission is granted to copy, distribute and/or modify this
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document under the terms of the GNU Free Documentation License, Version 1.1
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or any later version published by the Free Software Foundation; with no
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Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
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Texts. A copy of the license is included in the section entitled "GNU Free
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Documentation License".>
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</body>
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<\initial>
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<\collection>
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<associate|language|english>
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</collection>
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</initial> |