Generating Graph Movies in Excel V

These instructions apply to Excel V. These instructions are necessary because there appears to be no mention of quicktime movies in the Excel V manuals, although there is some limited on-line help available.The movie making facility implements a (very) limited subset of the graphing or "charting" facilities of Excel. Only the first option for each graph type seems to be generally available, although there are some partial exceptions. For scientific graphs, the most useful choices are a "line" plot, with plotting symbols and a line joining the points, or an xy plot involving plotting symbols and/or a line. If the x variable values are equally spaced, choose the line option, if not, choose the xy option. The best-looking graphs are obtained with equally spaced x values and the line option. Note that Excel V can only accommodate 256 columns, so that is the maximum number of data points.

Check that you have the Quicktime extension installed in the System Folder, and that you have a movie player such as Apple's "Movieplayer" available.Then:-
1) Start up Excel V.
2) Drag down the TOOLS Menu and select "ADD-INS". From the Add-Ins menu select MOVIEMAKER. A new entry, CREATE A MOVIE will then appear at the bottom of the TOOLS menu. You will only need to do this once - hereafter, the CREATE A MOVIE option will be automatically loaded.This would be a good time to review the help file on making movies, which can be found in the "Using Microsoft Excel" help file. (Accessed through the ? button at the top right hand side of the tool bar). Use the search facility and look for "Moviemaker".
3) Create the spreadsheet that you wish to graph, organising it so that the x values are in the first row, and successive rows contain functional values y(x,t) one row for each successive value of t. If the x values are in a regular monotonic sequence, evenly spaced, select the line plot in what follows; otherwise choose the xy plot option. For a line plot, ta first row may be inserted containing labels for the x axis, and similarly a first column may be inserted containg labels for each frame. In the case of an XY plot, the first row should contain X values, and the first column may contain labels for each frame. You will be asked to specify the contents of the first row and column, ie labels or data, at a later stage.
4) Highlight the whole block by dragging over it.
5) Select CHART from the INSERT menu, and then "As New Sheet" from the options presented.
6) A CHARTWIZARD window will appear with the first of five steps: Step 1 just repeats your selection definition. Step 2 lets you choose the plot type. Line plots and xy plots are the usual choices for scientific work. Step 3 lets you choose the sub-type. However, it is often a waste of time selecting anything other than the first option for the sub-type (labelled 1) - even though the chart may come out as expected, the movie will default back to type 1. One partial exception is the option 10 for line plot, which results in a movie with smoothed lines but still with plotting symbols. Step 4: A preview graph will appear. Choose "Data series in rows", then if the first row contains x values (xy plot) or x axis labels ( line plot) select n=1 in the option "Use first n rows for Category (X) axis labels" of a line plot, or "Use first n rows for X data" for an xy plot. Similarly, if there are labels for the y data in the first column, select n=1 in the corresponding box, otherwise set this to zero. This label will be printed in the legend on each movie frame as a description of each set of y data. Do not panic about a huge legend box blotting out the graph - when the movie is made, just one legend entry will appear on each frame. Step 5 lets you add a title, and labels for the x and y axes. You can change these later if you want to 7) Under INSERT menu, use "Text" to attach or change labels on axes and a caption if desired. You have a choice of fonts and sizes. Several other insertions can be made under INSERT as well.
8) However, by far the most useful way to edit the graph is simply to double click on any feature: labels, axes etc. You get lots of self-explanatory choices of scales, fonts, sizes, alignment, patterns etc. One important choice at this stage is autoscaling - usually one wants to dispense with it and use manually selected maximum and minimum y values; otherwise the movies end up being difficult to follow if the scale changes between frames.
9) When happy with the chart, go to the TOOLS menu and select OPTIONS. Choose chart from the folder which appears, and cross the box labelled "Chart scales with window size". This lets you control the size of the final movie frames by dragging the chart window to whatever size you want. (Without crossing this box, the movies can be too big to fit in a screen.) You may also want to save the current chart format using the bottom boxes available in this window - this means that you can use the current chart format as a default option for future graphs - it will appear when under the FORMAT menu you select "Autoformat".
10) Under the VIEW menu, choose Full Screen, and then size the frame as you desire for the final movie. The storage requirements scale with the area selected.
11) Do a dummy OPEN under the FILE menu so as to organise in advance the folder into which the forthcoming movie will be stored. (You don't get the chance to do this in the actual movie creation step!) Don't actually open a file, just open the required folder and then cancel.
12) Choose "Create a Movie" under the TOOLS menu.
13) Select ONE SERIES AT A TIME. Give the movie a name when prompted; it will be saved in the current folder (see 11 above). You can choose the replay speed. When Excel has finished, close the chart and spreadsheet windows, and quit from Excel if desired.
14) The movies can be replayed using Movie Player (which can play several movies simultaneously; quite useful for comparisons), or any of a number of equivalent players (Simple Player, Peter's Player etc); even Word V has a simple movie-playing capability.Trying to determine what Excel V does and does not do when creating movies has been very much a try-it-and-see exercise, since the documentation is not very helpful, and I may have overlooked some features.


Comments etc to : jo@nat.vu.nl