Type: Function
Description: Returns the nth coefficient of a complex Fourier series expansion. The PERIOD variable must be in the CAS directory, CASDIR, or in current path, and set to hold L, the period of the input function. The expression is expanded in terms of the current CAS variable.
Access: Calculus !ÖDERIV. & INTEG.
Input: Level 1/Argument 2: An expression in terms of the current variable Level 2/Argument 1: The number, n, of the coefficient to return.
Output: The nth Fourier coefficient of the expression.
Flags: Exact mode must be set (flag
Complex mode must be set, that is, flag
Example: Obtain the Fourier coefficient as below, with the default value of 2π in the PERIOD variable in CASDIR, and simplify it with EXPAND:
Command: | FOURIER(X^2,0) |
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| EXPAND(ANS(1)) |
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Result: | 4/3* π^2 |
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FP | Function |
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Type: |
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Description: | Fractional Part Function: Returns the fractional part of the argument. |
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Access: | !´REAL LFP | ( ´is the | ||
Flags: | Numerical Results |
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Input/Output: |
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| Level 1/Argument 1 |
| Level 1/Item 1 |
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| x | → | y |
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| x_unit | → | y_unit |
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| 'symb' | → | 'FP(symb)' |
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Example 1: |
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Example 2: | 32.3_m FP returns .3_m. |
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See also: | IP |
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FREE | Command |
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Type: |
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Description: | Do not use this command, a | |||
Access: | …µFREE |
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FREEZE | Command |
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Type: |
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Description: | Freeze Display Command: Freezes the part of the display specified by ndisplay area, so that it is not | |||
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| Normally, the stack display is updated as soon as the calculator is ready for data input. For | |||
| example, when HALT stops a running program, or when a program ends, any displayed messages |
are cleared. The FREEZE command “freezes” a part or all of the display so that it is not updated until a key is pressed. This allows, for example, a prompting message to persist after a program halts to await data input.
ndisplay area is the sum of the value codes for the areas to be frozen:
Full Command and Function Reference