HF Scientific Calculator 5.5
Basic Operation
Mode
The calculator has nine modes of operation - Scientific Mode, Basic Mode, Complex Mode, Base In Mode, Matrix Mode,
Equation Solver, Graph and Unit Converter. The current mode is shown in the top right.
To select a mode:
- Press MODE
- Select the mode
To toggle fraction mode, press (SHIFT + HYP). Fraction works only in Basic or Scientific mode.
Secondary Function
Each key is associated with a secondary function shown in yellow above the key. To select a secondary function:
- Press SHIFT key
- Press the key corresponding to the secondary function
Alternatively, the seondary function of each key can also be accessed by holding down the key.
Angle Units
The calculator supports degree, radian and grade. The current angle unit is shown on the display at the top.
To toggle the angle units, press
DRG key.
To change a number from one angle unit to another, press ( SHIFT +
DRG ) after
entering the number in the input field.
Calculation History
The calculator stores the last hundred results alongwith the input expressions. Each time you press = key, the result is added to the history list. The calculation history can be accessed
via the options menu.
Use normal click to select the result and long click (click and hold) to select the input expression.
The most recent result is stored in a special variable "Ans", which can be accessed by pressing ( SHIFT + = ).
History can be cleared using RESET in options menu.
Memory
The calculator has ten memory locations - one main memory M and nine additional memory locaions M
1
, M
2
, M
3
, M
4
, M
5
, M
6
, M
7
, M
8
, M
9
.
MR recalls the value from the main memory M
MS stores the display value to the main memory M
M+ adds the display to the main memory M
or ( SHIFT + M+ ) subtracts the display from the main
memory M
To read any of the additional memory locations, use ( SHIFT + MR )
To store to any of the additional memory locations, use ( SHIFT + MS )
Memory can be cleared using RESET in options menu.
Complex Mode
This mode supports rectangular as well as polar form of complex numbers.
To represent complex numbers in polar form use ∠
Use to calculate magnitude of a complex number and to calculate the argument.
Getting result in rectangular or polar form
By default, result is shown in rectangular form (as shown at the top). Button
( SHIFT + 5) toggles the output between polar and rectangular form.
Matrix Mode
To enable matrix mode, press MODE and select Matrix.
The calculator supports matrix upto the order of 9 x 9. You can use the navigation keys to move across the
matrix cells. You can also touch a matrix cell to select it.
Initializing matrix
- Press ( SHIFT + 7 )
- Select matrix (Press 1 for Matrix A, 2 for Matrix B,
3 for Matrix C)
- Enter dimensions of the matrix and press ( SHIFT + DEL )
- Pressing = stores the data from the input field in the selected matrix cell
- The matrix is automatically saved each time you press =
- Press AC to return to the main screen
Editing matrix
- Press ( SHIFT + 8 )
- Select matrix (Press 1 for Matrix A, 2 for Matrix B,
3 for Matrix C)
- Edit the matrix as desired. Each time you press = , the data of the selected
matrix cell is over written
- Press AC to return to the main screen
Using matrix in calculations
- Press ( SHIFT + 9 )
- Select matrix (Press 1 for Matrix A, 2 for Matrix B,
3 for Matrix C)
- The selected matrix appears in the input field
Addtional matrix operations
- ( SHIFT + 4 ) for calculating matrix transpose
- ( SHIFT + 5 ) for calculating matrix inverse
- ( SHIFT + 6 ) for calculating matrix determinant
Equation Solver
The calculator can solve simultaneuos linear equations (upto 9 unknown variables) and polynomial equation (upto
degree 9).
Press MODE and select EQUATION.
Press 1 for Simultaneous Linear Equations or 2 for Polynomial Equation.
Simultaneous Linear Equations
- Enter the number of unknown variables and press ( SHIFT + DEL
)
- Enter the linear equations in the form of a coefficient matrix. Each row of the matrix corresponds to an
equation and the columns correspond to the coefficients of the variables. The last column labeled "C"
corresponds to the constant term on the right side of the equation.
- After entering all the coefficients in the matrix, press solve ( SHIFT + 3 )
Polynomial Equation
- Enter the degree of the equation and press ( SHIFT + DEL )
- Enter the coefficients. ai refers to the coefficient of the term containing xi. For
any xi which is not present in the equation, enter 0 as coefficient.
- After entering all the coefficients in the matrix, press solve ( SHIFT + 3 )
Graph
The calculator has an inbuilt graph plotter which is accessible via the button MODE. It can plot the graph of three
equations simultaneously.
Draw graph
You can enter upto three funcitions - f(x), g(x) and h(x). f(x) is shown in yellow, g(x) in blue and h(x) in green.
- To enter a function, tap on the corresponding input field. This will open the main calculator interface.
- Now enter the function. Use the key X at the top row to enter the variable x.
- Press = after entering the function
- Click on DRAW after entering all the functions.
Additional Settings
You can initialize the graph so that the centre of the screen aligns with a given co-ordinate (x,y). By default, the
graph is aligned with the origin (0,0)
Grid spacing allows you to set the spacing between the grids in the graph. You can enter any value you
want.
Graph Operations
You can zoom the graph using the zoom keys at the bottom. Multi touch can also be used for zooming.
Tracing allows you to trace the co-ordinates of the graphs of the functions. Use the radio button at the bottom
to toggle tracing mode. You cannot translate a graph while it is in tracing mode.
Unit Converter
The unit converter can be accessed via the button ( SHIFT +
3 ).
The unit converter works only in Scientific, Complex and Matrix Mode.
To convert:
- Press ( SHIFT + 3 ).
- Select a category from the popup dialog.
- Select the input unit.
- Select the desired output unit.