Matrix Basics Help

Subject Areas

Tools / Misc

bCalc

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scrnGC2: Calc Input

scrnGC3: f(x) Plot Input

scrnGC4: g(x) Plot Input

The inputs above will be hidden when the program finally gets launched. Currently, I am not hiding them even when you close the calculator. The purpose of the inputs is to help in debugging. This allows you to enter simple code on the calculator screen but the program translates the input to javascript math. Give it a try and see if you notice any obvious problems or have suggestions for improvements.

gCalc

drag-N-drop

Select precision* of answer:

Select angle mode:

Enter expression to evaluate here:

The answer is shown below:

Enter function to be plotted:

f(x) =

Enter 2nd function, if needed:

g(x) =

Change or reset the x-y scaling below:

x_min =

x_max =

y_min =

y_max =

Accuracy Disclaimer

The javascript math object methods used for this calculator are not accurate for very large or very small numbers. In particular, the trigonometric functions may yield very small answers that should actually be zero or very large answers that should be infinite. This typically occurs at 90° or pi/2 intervals.

DO NOT USE WHERE HIGH PRECISION IS REQUIRED. USE AT YOUR OWN RISK.

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Matrix Basics Help

Matrix Dimensions

Matrices are dimensioned by rows and columns, which is typically shown as rxc.

Example 1:

is a 1x3 matrix.

Example 2:

is a 2x3 matrix.

Example 3:

is a 3x1 matrix.

Example 4:

is a 3x2 matrix.

Matrix Addition and Subtraction

When adding or subtracting matrices all of the matrices must have the same dimension. Addition or subtraction is performed by the identical position entry of each matrix; i.e. [a b] + [c d] = [a+c b+d] and [a b] - [c d] = [a-c b-d]. Be careful when subtracting negative numbers.

Example 5:

Example 6:

Example 7:

Example 8:

Scalar Multiplication

The scalar product of a matrix is found by multiplying every single term by the scalar multiplier.

Example 9:

Example 10:

Example 11:

Example 12: