There is no command line in Math Touch. Instead, there is a free-form canvas in which you insert equations, plots and astronomical observations. Tap the insert menu "+" to begin inserting. You can move the items around by pressing and holding until the item jumps up, then you can move it around and it will drop in place.
Scientists and engineers find that the variable names in equations help them maintain a sense of physical significance, so in Math Touch, the variable names do not change. You can get more information about a variable by tapping it. An editor will display providing you more information about the variable and (if it has been specified) the dimension in which the term is required.
With the editor for a variable displayed, you may tap in the value field and enter a value. You need to specify the numbers and units. If the variable requires a particular dimension, the value will be analyzed to make sure it resolves to the correct dimension. If it does not, there will be a warning, and the value will not be set.
Tap here to learn more about entering values with units.
Since variable names do not change, the way to tell Math Touch that two variables have the same value is to link them visually with a "wire." To wire two symbols together, tap one of the variables; to the left of the value is a wire button, press and hold this button and the editor will fade out. Now you can drag the wire to another variable. If the other variable is in the same dimension, a popup of it will appear when you pass your finger over it. Lift your finger to connect the wire.
Tap here to learn more about linking equations to plots.
Copying Deleting items
To delete an equation, tap on the "=" mark which will pop up a menu containing "Copy" and "Delete". Once you have copied an item, you can paste it by a long-tap in any empty space on the canvas, which will display a "Paste" button. You may also long-tap in the equation editor and paste an equation from the canvas, this allows you to quickly edit equations from the canvas.
You can have many canvases, each is saved as a file you can share. For more on sharing, tap here. On iPad, tap the "My Canvases" button in the upper left corner. On iPhone, tap the "i" info button then "Canvases." Your canvas will be frozen into a preview, and previews of other canvases will be displayed. Swipe canvases from left and right; information about the current one is displayed at the bottom. The three buttons at the bottom help you share the current canvas via email, duplicate the canvas and delete it. You can also tap the button in the upper left to create a new canvas.