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61 lines
2.2 KiB
61 lines
2.2 KiB
15 years ago
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<chapter id="first-steps">
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<title>First Steps With &kmplot;</title>
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<sect1 id="simple-function-plot">
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<title>Simple Function Plot</title>
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<para>
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In the main toolbar there is a simple text box in which you can enter
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a function expression. Simply enter:
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<screen><userinput>x^2</userinput></screen> and press &Enter;. This
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will draw the plot of y=x^2 in the coordinate system. Enter another
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expression in the text box like
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<screen><userinput>5*sin(x)</userinput></screen> and another plot will
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be added.
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</para>
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<para>Click on one of the lines you have just plotted. Now the cross
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hair gets the color of the plot and is attached to the plot. You can
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use the mouse to move the cross hair along the plot. In the status
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bar at the bottom of the window the coordinates of the current
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position is displayed. Note that if the plot touches the x-axis the
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root will be displayed in the status bar, too.</para>
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<para>Click the mouse again and the cross hair will be detached from
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the plot.</para>
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</sect1>
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<sect1 id="edit-properties">
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<title>Edit Properties</title>
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<para>Let us make some changes to the function and change the color of
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the plot.</para>
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<para>You can edit all functions with the
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<menuchoice><guimenu>Plot</guimenu><guimenuitem>Edit
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Plots...</guimenuitem> </menuchoice> menu entry. A dialog appears
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which lists all the functions that you have plotted. Notice that
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&kmplot; has automatically found a unique function name for your
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expressions and completed the expression to a function
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equation.</para>
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<para>Select <guilabel>f(x)=x^2</guilabel> in the list. A double click
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or pressing the <guibutton>Edit</guibutton> button will show you a
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dialog window. Here you have access to a lot of options. Let us rename
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the function and move the plot 5 units down. Change the function
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equation to <screen><userinput>parabola(x)=x^2-5</userinput></screen>
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</para>
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<para>To select another color for the plot click into the
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<guilabel>Color:</guilabel> box. Finally press
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<guibutton>OK</guibutton> and your changes take effect in the
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coordinate system.</para>
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<note><para>All changes can be undone until you press
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<guibutton>OK</guibutton> in the <guilabel>Edit Plots</guilabel>
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dialog.</para>
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</note>
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</sect1>
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</chapter>
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