Question about Texas Instruments TI-84 Plus Calculator

TI-84: error when multiplying matrix with negative number

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Having gone over a month with no response, I assume this is no longer a problem.

Posted on Sep 07, 2010

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Posted on Jan 02, 2017

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Use the (-) key just to the right of the decimal point key to enter negative numbers everywhere, not only in matrices. The - key to the right of the 6 key is to subtract one value from another. The (-) key is to enter a single negative value.

Jan 27, 2013 | Office Equipment & Supplies

Use the (-) key just to the right of the decimal point, not the - key. The second key is for subtraction.

Jan 27, 2013 | Texas Instruments TI-84 Plus Calculator

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Apr 02, 2012 | Texas Instruments TI-84 Plus Silver...

Use the (-) key (just to the right of the decimal point key) instead of the - key when entering a negative number (not just exponents).

- is used to subtract one value from another. (-) is used to negate a value. - operates on two numbers, (-) operates on one.

- is used to subtract one value from another. (-) is used to negate a value. - operates on two numbers, (-) operates on one.

Mar 14, 2012 | Texas Instruments TI-84 Plus Calculator

You'll get the same error if you try to divide two matrices with real numbers. The TI-89 doesn't allow you to divide a matrix by another. However, you can multiply a matrix by the reciprocal of the other.

For example, to calculate A/B, calculate instead A*B^-1 . Makes sure you use the (-) key just to the right of the decimal point key to put in the negative sign before the "1".

For example, to calculate A/B, calculate instead A*B^-1 . Makes sure you use the (-) key just to the right of the decimal point key to put in the negative sign before the "1".

Sep 10, 2011 | Texas Instruments TI-89 Calculator

Matrix multiplication is defined only when the width of the first matrix is equal to the height of the second. You can multiply a 2x2 matrix by a 1x2 matrix or multiply a 2x1 matrix by a 2x2 matrix, but you cannot multiply a 2x2 matrix by a 2x1 matrix.

Jun 13, 2011 | Texas Instruments TI-89 Calculator

Be sure to use the (-) negative key and not the - minus key.

Feb 20, 2011 | Texas Instruments TI-84 Plus Calculator

The TI-84 allows only real numbers in a matrix.

You can write programs to deal with complex numbers in lists, simulating matrices. One such program is at http://www.ticalc.org/archives/files/fileinfo/250/25081.html

You can write programs to deal with complex numbers in lists, simulating matrices. One such program is at http://www.ticalc.org/archives/files/fileinfo/250/25081.html

Feb 02, 2011 | Texas Instruments TI-84 Plus Calculator

Dimensions of matrices involved in operations must match.

Here is a short summary

You can only add and subtract matrices that have the same dimensions: the numbers of rows must be equal, and the number of columns must be equal.

The multiplication of structured mathematical entities (vectors, complex numbers, matrices, etc.) is different from the multiplication of unstructured (scalar) mathematical entities (regular umbers). As you well know matrix multiplication is not commutative> This has to do with the dimensions.

An**mXn **matrix has** m rows **and**
n columns**. To perform multiplication of an **kXl** matrix by
an **mXn** matrix you multiply each element in one row of the first
matrix by a specific element in a column of the second matrix. This
imposes a condition, namely that the number of columns of the first
matrix be equal to the number of rows of the second.

Thus, to be able to multiply a kXl matrix by am mXn matrix, the number of columns of the first (l) must be equal to the number of rows of the second (m).

Let there be two matrices MatA and MatB. The dimensions are indicated as mXn where m and n are natural numbers (1,2,3...)

The product** MatA(kXl) * MatB(mXn) is possible only if l=m**

MatA(kX3) * MatB(3Xn) is possible and meaningful, but

MatA(kX3) * MatB(nX3) may not be possible.

To get back to your calculation, make sure that the number of columns of the first matrix is equal to the number of rows of the second.** If this condition is not satisfied, the calculator
returns a dimension error**. The order of the matrices in the
multiplication is, shall we say, vital.

Here is a short summary

You can only add and subtract matrices that have the same dimensions: the numbers of rows must be equal, and the number of columns must be equal.

The multiplication of structured mathematical entities (vectors, complex numbers, matrices, etc.) is different from the multiplication of unstructured (scalar) mathematical entities (regular umbers). As you well know matrix multiplication is not commutative> This has to do with the dimensions.

An

Thus, to be able to multiply a kXl matrix by am mXn matrix, the number of columns of the first (l) must be equal to the number of rows of the second (m).

Let there be two matrices MatA and MatB. The dimensions are indicated as mXn where m and n are natural numbers (1,2,3...)

The product

MatA(kX3) * MatB(3Xn) is possible and meaningful, but

MatA(kX3) * MatB(nX3) may not be possible.

To get back to your calculation, make sure that the number of columns of the first matrix is equal to the number of rows of the second.

Oct 30, 2010 | Texas Instruments TI-84 Plus Calculator

Hello,

The so-called (2x1) matrix is not a matrix. It is a vector.

Hope it helps.

The so-called (2x1) matrix is not a matrix. It is a vector.

Hope it helps.

Apr 26, 2009 | Texas Instruments TI-89 Calculator

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Usually answered in minutes!

Okay, I realize this is a dumb question, but are you sure you're multiplying by a negative number? That is, you used the (-) key instead of the - key to input the negative number?

What is the error you're getting?

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