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Page Revision: 2013/04/17 09:44

How to add an empty graph

You can add a 2D/3D Graph from the Insert item in the menu bar:

Insert > Plot > 2D / 3D

Keyboard shortcut: a 2D Graph can be added directly typing @

Now an empty graph will be added:

Plot equations

Variables to plot equations must be:

• x for 2D graphs

• x and/or y for 3D graphs

• t to animate 2D and 3D graphs

NOTE: variables are case sensitive (x is different from X)

You have multiple ways to plot equations:

Directly from the plot window

Indirectly, building your equation outside the plot window

Plot matrices

You can plot figures from matrices (directly or indirectly):

• 2 columns matrices for 2D plots

• 3 columns matrices for 3D plots

Multiple plots

You can plot multiple equations/matrices on the same graph using the Multiple values item on the Functions toolbox:

Each "value" will be colored differently (cycling between 6 colours, in the following order: blue, red, green, magenta, orange and brown)

Special plots (words, points, colors...)

You can plot words or characters (strings) on your graphs;

• Special characters (case sensitive) have position fixed on center on the given coordinates: + . * o x;

• Words, phrases or non-special characters have top-left corner of (virtual) textbox fixed on the given coordinates;

• Many colors are allowed, using web format (like #6699CC) or by name; here is a complete list of possible colors (spaces and upper case letters are not matter):

aliceblue, antiquewhite, aqua, aquamarine, azure,

beige, bisque, blanchedalmond, black, blue, blueviolet, brown, burlywood,

cadetblue, chartreuse, chocolate, coral, cornflowerblue, cornsilk, crimson, cyan,

darkblue, darkcyan, darkgoldenrod, darkgray, darkgreen, darkkhaki, darkmagenta, darkolivegreen, darkorange, darkorchid, darkred,
darksalmon, darkseagreen, darkslateblue, darkslategray, darkturquoise, darkviolet, deeppink, deepskyblue, dimgray, dodgerblue,

firebrick, floralwhite, forestgreen, fuchsia,

gainsboro, ghostwhite, gold, goldenrod, gray, green, greenyellow,

honeydew, hotpink,

indianred, indigo, ivory,

khaki,

lavender, lavenderblush, lawngreen, lemonchiffon, lightblue, lightcoral, lightcyan, lightgoldenrodyellow, lightgray, lightgreen,
lightpink, lightsalmon, lightseagreen, lightskyblue, lightslategray, lightsteelblue, lightyellow, lime, limegreen, linen,

magenta, maroon, mediumaquamarine, mediumblue, mediumorchid, mediumpurple, mediumseagreen, mediumslateblue, mediumspringgreen,
mediumturquoise, mediumvioletred, midnightblue, mintcream, mistyrose, moccasin,

navajowhite, navy,

oldlace, olive, olivedrab, orange, orangered, orchid,

palegoldenrod, palegreen, paleturquoise, palevioletred, papayawhip, peachpuff, peru, pink, plum, powderblue, purple,

red, rosybrown, royalblue,

saddlebrown, salmon, sandybrown, seagreen, seashell, sienna, silver, skyblue, slateblue, slategray, snow, springgreen, steelblue,

tan, teal, thistle, tomato, turquoise,

violet,

wheat, white, whitesmoke,

yellow, yellowgreen

NOTE(1): You can use darkblue, DarkBlue, Dark Blue (recommended), DARKBLUE, D a R k B l U e ant etc...
all spaces will be removed and color name will be converted to lower case chars.

NOTE(2): You can use number instead of color name or web-color.

Number composing rule is a bit complex, but it is similar with web-colors: color represented as a hexadecimal number where
- first pair is opacity;
- second pair is a Red Component;
- third pair is a Green Component;
- fourth pair is a Blue Component;
For example FF00FF00 is a full-opacity Green color (FF 00 FF 00).

When you have a hexadecimal number you need to convert it to decimal number to use it in SMath Studio.
There are snippets to make easy this conversion (see References).

Note that because of the maximum 32-bit integer is 2147483647 (0xFFFFFFFF/2) and FF00FF00 = 4278255360 (i.e. greater then the max. integer),
then Green is FF00FF00-0xFFFFFFFF-1=-16711936.

Using an if/else statement

NOTE: Any text (empty or not) or message from the error function will be ignored.

Using booleans as function parameters

NOTE: infinite values will be ignored.