We're glad you came by, but you might find what you're looking for elsewhere.
TI-Basic Developer is not the site it once was. While its information on commands and other calculator features remains almost second-to-none, its forum, archives, and even hosting service, Wikidot, have been decaying for years. The calculator community would love to see what you're working on, or help you in your next coding adventure, but TI-Basic Developer is no longer the place to do it.
Instead, you should head over to Cemetech (primarily American) or TI-Planet (primarily international). Both are active, well-established forums with their own archives, chatrooms, reference material, and abundant coding tools and resources. We'll see you there, we hope.
Adds two values, using element-by-element addition when adding a matrix and a number.
value1 .+ value2
Menu Location
- Press 2nd MATH to enter the MATH menu.
- Press 4 to enter the Matrix submenu.
- Press K to enter the Element ops submenu.
- Press 1 to select .+.
…frankly, just typing it is way easier.
This command works on all calculators.
1 byte
The .+ command works like plain + in most cases, adding two values together. It's distinguished by its application to matrices: in particular, when adding a matrix and a scalar. Normal addition of a matrix and a single value will add that value along the main diagonal only: as though the value were multiplied by the identity matrix. However, .+ does the more intuitive thing (for anyone but an algebraist, anyway) and adds the value to every element of the matrix.
:[a,b;c,d]+x
[x+a b ]
[c x+d]
:[a,b;c,d].+x
[x+a x+b]
[x+c x+d]It doesn't really make much sense to use .+ to add other kinds of values, but you can do it if you like.
Although the order of the matrix and the scalar doesn't matter, be warned that in some cases, the . will be interpreted as a decimal point. You can put spaces to help the calculator figure out what you mean.
:5.+[a,b;c,d]
[a+5. b ]
[c d+5.]
:5 .+ [a,b;c,d]
[a+5 b+5]
[c+5 d+5]