Usage

Here are some quick tips for using JNetCalc. For step by step instructions, see example 1 or example 2. Be sure to experiment!

You enter expressions into the spreadsheet by clicking once on a cell, similar to MS Excel. Then type the expression to enter into the input field at the top, using the toolbar functions if you like. When you press ENTER the expression is evaluated, properly rendered, and entered into the spreadsheet.

	Tip: To copy an existing cell into the cell you are currently editing, hold down the ALT key while clicking on the cell to copy
	Tip: To re-evaluate an existing cell (perhaps you have applied some assumptions), hold down the CTRL key will pressing ENTER

To apply a procedure such as factoring or differentiation, first select the cell to which the operation should apply, then click on the appropriate button on the left. The operation will be applied to the selected cell and inserted below that cell.

To plot a 2D or 3D function, first enter the function into an existing cell. Then switch to the "Plot" tab on the left and click on "Add" to add your function to the plot. You can add multiple functions to the plot by repeatadly clicking "Add".

	Tip: Not all combinations of options are available or applicable when plotting particular functions. If you get a "no plot available" message, adjust the options and click on "Draw" to redraw the function(s).
	Tip: You can plot multiple 3D surfaces easily. Enter the surfaces to plot into the spreadsheet, check the "3D" option on the Plot tab, then "Add" the surfaces to your plot. You can rotate, zoom, and pan using the 'keypad' buttons.

You can enter HTML-formatted text into the "Expression" cells. Any text that starts with a double quote " will be formatted as HTML text, using the HTML tags you enter.

Example 1: A Function and its Derivative

	Click once on the top left cell. Click on the input field if necessary and enter `"<h1>My First Example</h1>"`Then hit ENTER. The size of this cell and all subsequent cells will automatically adjust when you enter more expressions.
	While the second cell is highlighted, enter the expression `x^2*(1-x) / (x^2 - 1)`and press ENTER. The expression will show up nicely formatted in the "Result" column.
	Highlight the cell you just entered and click on "Factor". JNetCalc will factor and reduce the fraction and insert the result below the currently selected cell.
	Highlight the new cell, containing the factored expression and switch to the "Calc" tab on the left. Enter the differentiation variable "x" in the field labeled "with respect to" next to the "Differentiate" button, then click the "Differentiate" button. JNetCalc will differentiate the expression and enter the result below the original expression.

	Highlight the derivative and 'right-click' on that cell. Choose "Insert Row" to insert an empty row at that position. Click on that inserted row and type (including the quotes): "<b>Derivative</b>", followed by ENTER.
	Switch to the "Plot" tab on the left. Highlight the original expression and click on "Add". Then highlight the differentiated expression and click on "Add" again. You will see the graph of the function together with its derivative.
	Both functions are not continuous, so check the "Discont." checkbox in the "Options" group. Then click on "Draw" to redraw your function. You should now see the proper graphs.

Example 2: Solving an Expression manually

	Enter the following expression in a new cell. Use the "sqrt" button on the toolbar to simplify the entry of the square root function: `sqrt(1 + sqrt(1 + x)) = 2` To solve this equation manually, we first want to square both sides. Click on the "Basics" tab on the left. At the bottom of that tap you find the "Apply" operation, where the equation is represented by the symbol EQ. Make sure the expression you want to manipulate is currently selected in the spreadsheet.
	To square both sides of the equation, make sure the input next to the Apply button says EQ^2 and press Apply (or hit ENTER). Both sides of the equation are squared, removing one of the square roots.
	Next we want to add 1 to both sides of the equation. Enter EQ-1 and click Apply (or hit ENTER) to accomplish that.
	Now we have isolated the second root, so we can square the equation again. Enter EQ^2 and click Apply.
	Finally we can subtract 1 from both sides of the equation to see the answer.

To verify our answer, highlight the original expression sqrt(1 + sqrt(1 + x)) = 2 and click on the "Solve" button. JNetCalc will solve the equation immediately and insert the result below the selected cell.