User interface

The main area is a Sheet, where the calculations are made;

Sheet

The sheet is the main part of CalcMe. It can be thought of as three areas - one for calculations, one for definitions, and one for graphics. A single CalcMe session can have multiple sheets, as described in the last section of this page.

Area for Calculating

Area for Graphing

Area for Defining

Here is where all formulas and calculations are written. When you open a new CalcMe session, by default you begin writing in this area. The whole area is organized into lines, like a piece of ruled paper. You write calculations, one in each line.

Initially, a new line has an empty box with a cursor inside it, ready to accept new formulas. You usually write a formula and then press an Action to get a result. So, in one line you'll have each of: Formula, Action, and Result.

Each line has three buttons on the right:

• Insert a new line, before this one
• Recalculate all
• Remove this line

To insert a new line between two existing ones, you can also click on the narrow space that exists between the lines. You can rearrange the lines; drag a line and drop it to the new place. Try a calculation now:

• Write any formula.
• Apply an action. The default action is Calc. Click on the rightmost Toolbar button, or simply press the Return key on your keyboard.
• You will get the result. The Calc action does different things in different types of formulas.

You can expect any formula that a scientific calculator would understand to be calculated here. However, CalcMe also carries out symbolic computations. If you write a letter such as a,b,c,x,y, etc. it will be treated as a "variable". For example:

To insert special symbols such as roots, fractions, etc. use the Toolbar, or the Menu.

CalcMe can graph functions, equations, inequalities, and points. Initially, there is no graph, but one is created when you use the Plot action. Try it yourself:

• Write a formula, and click on the Plot action to see the result.

Thus, the sheet can have an area on the right to show graphics. Once there is a graph, it comes with several options to configure it.

Furthermore, we can draw directly on the grid as we would do on a sheet of paper. Take a look to its dedicated page.

Each line has an area on the left where you can define variables and functions.

• You can enter a name for a value, such as price, and then use this label in calculations.
• You can also assign a value to the variable y, and all subsequent lines will use that value for y.
• You can enter a name for a function and define it using :=, and later you can derive it or plot it with the use of that label. Using := assigns without evaluating (this is useful when dealing with programming commands).

• You can also define names for variables, that is define a variable without assigning a value to it. If you want to define more than one variable, you can do it one by one or all in once separating them by commas.

A session can have multiple sheets. Initially, there is just one sheet, but you can add more by using the New sheet button. It's the one with a plus (+) sign, located to the right of the session title.

Each sheet has a name --by default, Sheet 1-- located to the right of the session title. You can change the name by clicking on it.

Multiple Sheets

When you Save or Open a session, all its sheets will be saved or opened as well.

You can move between sheets using the tabs on the upper left. You can rearrange the sheets by dragging and dropping the tabs. You can delete a sheet using the corresponding button in its tab.

The toolbar is at the top of the sheet, where it provides fast access to several useful buttons.

Toolbar

• On the left, there are buttons for the Most frequently used operations.
• On the right, there are buttons for general Actions.

Most used operations

Actions

See also Keyboard shortcuts to make your work easier.

Frequently used operations have buttons in the toolbar for faster access.

Most frequently used operations
	Fraction
	Power
	Square root
	Newline

For Square root, Fraction and Power you can select a portion of a formula before pressing the button. The operation will be build around it.

For Fraction you can also use the keyboard 2/3, but it won't look very nice. For Power you can type 2^3 and it will automatically be converted to the nicer form.

Use Newline to enter systems of equations. Also, you can use it in a command that takes a list as input. So, you can work with vertical lists, which are usually more readable.

Given a formula, you can perform multiple Actions on it. Actions are big buttons, each with an icon and a name. The general actions are in the Toolbar, unless Calc which can be found at the lower right corner.

Actions
	Calc
	Approx
	Simplify
	Factor
	Substitute
	Verify
	Derivate
	Integrate
	Plot
	Plot 3D
	Text
	Add image

Some actions are configurable, and some are not. You configure an action by clicking its symbol in the line. This symbol is placed between the initial formula and the calculated result. For example, you can change the color of a function graph by clicking the Plot symbol of a line.

After reconfiguration, the line is automatically recalculated. Each time you recalculate a line, all other lines will also be recalculated.

The Text action is special: It doesn't act on an existing formula but instead creates a new line to contain text that will not be calculated. You can use it for comments. Text lines have a light-green borders. See Format for text options.

The most common action is Calc. It does different things, depending on the input:

• Over a numerical expression, it calculates it.
• Over an algebraic expression, it reduces/simplifies it.
• Over a programming command, it executes it.
• Over an equation or a system, it solves it.

The menu, shown on the left, contains a complete list of buttons and commands, which are grouped into sections.

Menú

In the top left corner of the CalcMe window, you'll see a small toolbar:

These buttons help you manage your sessions or change global settings.

Tools
	More See table below.
	Save Save the session in online storage. For information on how this works, see Saving your work below.
	Application settings See the section below.
	Help This manual.

More
	New Opens another CalcMe window.
	Open Load a session from online storage.
	Save as ... Do not update the current session file, but save it as a new one in online storage.
	Remove this document Remove it from online storage.
	Download Get the session file, to save it locally, in your device.
	Download as PDF Get a printable PDF.
	Upload Load a session file from your device.

The language used in CalcMe when you open it is guessed from various sources. Of course, you may also choose any of the supported languages. Select the Save settings in cookies option if you want to make the change permanent (on your internet browser).

You can set the number of significant digits to be shown when results have decimal numbers. The valid values are from 1 to 15, which is the maximum. The last digit is rounded to nearest with half up tie-breaking, just like the round() command.

Precision
Significant digits: 4
Significant digits: 15

As with a handheld calculator, in CalcMe you can work with angles in one of two modes:

• RAD: radians. A turn is $$2\mathrm\pi$$. This is the default mode.
• DEG: degrees. A turn is 360º.

Unit of angle
Unit of angle: radians	Unit of angle: degrees

When you use a direct trigonometric function (e.g., sin(2)), the input angle is assumed to be in radians or degrees, according to the mode. When using an inverse trigonometric function (e.g., arcsin(0.5)) the result angle should also be interpreted according to the mode. See the trigonometric functions section. Commands argument() and polar(), for complex numbers are like arctan(), and their results are also according to the mode.

CalcMe uses online storage by default, via Google Drive. However, you can also save and load sessions from your local device (desktop computer, laptop, handheld device, etc.).

To save online, just press the Save button:

When you save a session for the first time, you'll be prompted to log in and give permission for CalcMe to associate with your Google Drive. Once you are logged in, you can see your profile photo in the title bar, shown at right.

You can also make sessions opened from Google Drive automatically take you to CalcMe. In Google Drive, just go to Settings > Managing apps, and tick Use by default next to CalcMe:

Additionally, once you've associated CalcMe to your Google Drive through the above steps, you will be able to open new CalcMe files directly from Google Drive. Just go to New in the top left corner > More > CalcMe:

To save sessions offline (directly to your device), click on More > Download:

This downloads a CalcMe session file, which you can then open again with the Upload button in the same drop-down menu.

These keyboard shortcuts are available to speed up your editing. The words shown in parentheses are suggested mnemonics.

You can drag-and-drop formulas by holding and moving them by the mark within the frame.

The formula will be copied, this way you can reuse formulas and results.

The variable in the second formula is substituted by the value in the first one.

The variable in the first formula will be defined from this point forward.

The formula will be plotted in a new plotter.

Autoformat replaces some symbols from keyboard by their better looking counterparts. At present the replacements are:

The replacement is done while you type, so you never see the actual key pressed.

Autoformat now auto-closes parentheses and alike. When you write the left enclosure, the right enclosure is automatically put.

These are the enclosers that have this feature:

If you want to modify this automatic end symbol, place the cursor next to the symbol, before it, on the inside part, and write the alternate end symbol.

See this example of an open-closed interval: