Question about Texas Instruments TI-84 Plus Calculator

# Error when multiplying martix with negative number

TI-84: error when multiplying matrix with negative number

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• kakima Jul 11, 2010

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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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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## Related Questions:

### I can't get a negative number in the matrix on the TI-84 calculator.

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

### I can't put a negative number in the matrix without a syntax error

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

### I have a TI-84. It gives me a syntax error when I try to enter problems with negative exponents.

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.

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

### I am dividing a 3*1 matrix with a 3*3 matrix with numbers in polar format and it gives me the error data type error.

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".

Sep 10, 2011 | Texas Instruments TI-89 Calculator

### Ti 89 titanium when multiply 2x2 matrix by 2x1 matrix get error diemensions

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

### I want to know how to solve a matrix with complex numbers in a 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

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

### Im trying to multiply matrices on my calculator and it always says "dim mismatch"

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.

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

### How do i multiply a (2x2) matrix by a (2x1) in the ti 89

Hello,
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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