Guard point and ftlen()

[Jacob Joaquin]

I'm trying to finish an article I'm writing for the Csound Journal and
came across this issue. I'm hoping someone on the list can help clear
this up.

Is there a way to detect whether or not an f-table was declared with a
size of a power of two, a power of 2 + 1 or a negative number inside
of an instrument?  I discovered that ftlen ignores the guard point,
whether or not the guard point is implicitly or explicitly stated.
The following two f-tables have sizes of 4 and 5, though ftlen()
returns the value 4 for both:

f 1 0 4 -2 1 2 3 4
f 2 0 5 -2 1 2 3 4 5

I wrote a test csd that prints the size of the tables, along with the
values at each index.  Here is the output (F-table Index: Value):

__excerpt from output__
new alloc for instr 1:
Size of table 1: 4
0: 1.000000
1: 2.000000
2: 3.000000
3: 4.000000
4: 1.000000
new alloc for instr 1:
Size of table 2: 4
0: 1.000000
1: 2.000000
2: 3.000000
3: 4.000000
4: 5.000000
__end__

Other tests I ran show that negatively sized f-tables do not produce a
guard point.  Is this correct?

Here's the test csd I used:

__csd__
<CsoundSynthesizer>
<CsInstruments>
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1

instr 1
    ifn = p4
    ilast_index = p5
    isize = ftlen(ifn)
    ii = 0
    printf_i "Size of table %d: %d\n", 1, ifn, isize

    begin_loop:
    if (ii >= ilast_index) igoto end_loop
        ivalue tab_i ii, ifn
        printf_i "%d: %2f\n", 1, ii, ivalue
        ii = ii + 1
        igoto begin_loop

    end_loop:
    turnoff
endin
</CsInstruments>
<CsScore>
f 1 0 4 -2 1 2 3 4
f 2 0 5 -2 1 2 3 4 5
i 1 0 1 1 5
i 1 0 1 2 5
</CsScore>
</CsoundSynthesizer>
__end__


Best,
Jake
--
The Csound Blog - http://csound.noisepages.com/


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[francibal]

Hi Mr. Jacob,
i don't know if it is right about Your study, but i have try Your csd with negative p3
in function statement and it works right.

Hope helpful.

<CsoundSynthesizer>
<CsInstruments>
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1

instr 1
    ifn = p4
    ilast_index = p5
    isize = ftlen(ifn)
    ii = 0
    printf_i "Size of table %d: %d\n", 1, ifn, isize

    begin_loop:
    if (ii >= ilast_index) igoto end_loop
        ivalue tab_i ii, ifn
        printf_i "%d: %2f\n", 1, ii, ivalue
        ii = ii + 1
        igoto begin_loop

    end_loop:
    turnoff
endin
</CsInstruments>
<CsScore>
f 1 0 4 -2 1 2 3 4
f 2 0 -5 -2 1 2 3 4 5
f 3 0 -6 -2 1 2 3 4 5 6
f 4 0 -7 -2 1 2 3 4 5 6 7
f 5 0 8 -2 1 2 3 4 5 6 7 8
f 6 0 -9 -2 1 2 3 4 5 6 7 8 9

i 1 0 1 1 10
i 1 0 1 2 .
i 1 0 1 3 .
i 1 0 1 4 .
i 1 0 1 5 .
i 1 0 1 6 .
</CsScore>
</CsoundSynthesizer>

Ciao,
fran.

Jacob Joaquin wrote:

I'm trying to finish an article I'm writing for the Csound Journal and
came across this issue. I'm hoping someone on the list can help clear
this up.

Is there a way to detect whether or not an f-table was declared with a
size of a power of two, a power of 2 + 1 or a negative number inside
of an instrument?  I discovered that ftlen ignores the guard point,
whether or not the guard point is implicitly or explicitly stated.
The following two f-tables have sizes of 4 and 5, though ftlen()
returns the value 4 for both:

f 1 0 4 -2 1 2 3 4
f 2 0 5 -2 1 2 3 4 5

I wrote a test csd that prints the size of the tables, along with the
values at each index.  Here is the output (F-table Index: Value):

__excerpt from output__
new alloc for instr 1:
Size of table 1: 4
0: 1.000000
1: 2.000000
2: 3.000000
3: 4.000000
4: 1.000000
new alloc for instr 1:
Size of table 2: 4
0: 1.000000
1: 2.000000
2: 3.000000
3: 4.000000
4: 5.000000
__end__

Other tests I ran show that negatively sized f-tables do not produce a
guard point.  Is this correct?

Here's the test csd I used:

__csd__
<CsoundSynthesizer>
<CsInstruments>
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1

instr 1
    ifn = p4
    ilast_index = p5
    isize = ftlen(ifn)
    ii = 0
    printf_i "Size of table %d: %d\n", 1, ifn, isize

    begin_loop:
    if (ii >= ilast_index) igoto end_loop
        ivalue tab_i ii, ifn
        printf_i "%d: %2f\n", 1, ii, ivalue
        ii = ii + 1
        igoto begin_loop

    end_loop:
    turnoff
endin
</CsInstruments>
<CsScore>
f 1 0 4 -2 1 2 3 4
f 2 0 5 -2 1 2 3 4 5
i 1 0 1 1 5
i 1 0 1 2 5
</CsScore>
</CsoundSynthesizer>
__end__


Best,
Jake
--
The Csound Blog - http://csound.noisepages.com/


Send bugs reports to this list.
To unsubscribe, send email [e-mail] with body "unsubscribe csound"

[francibal]

Ok, i've understand that i have talk too early ...
Sorry..

ciao,
fran.


Hi Mr. Jacob,
i don't know if it is right about Your study, but i have try Your csd with negative p3
in function statement and it works right.

Hope helpful.

<CsoundSynthesizer>
<CsInstruments>
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1

instr 1
    ifn = p4
    ilast_index = p5
    isize = ftlen(ifn)
    ii = 0
    printf_i "Size of table %d: %d\n", 1, ifn, isize

    begin_loop:
    if (ii >= ilast_index) igoto end_loop
        ivalue tab_i ii, ifn
        printf_i "%d: %2f\n", 1, ii, ivalue
        ii = ii + 1
        igoto begin_loop

    end_loop:
    turnoff
endin
</CsInstruments>
<CsScore>
f 1 0 4 -2 1 2 3 4
f 2 0 -5 -2 1 2 3 4 5
f 3 0 -6 -2 1 2 3 4 5 6
f 4 0 -7 -2 1 2 3 4 5 6 7
f 5 0 8 -2 1 2 3 4 5 6 7 8
f 6 0 -9 -2 1 2 3 4 5 6 7 8 9

i 1 0 1 1 10
i 1 0 1 2 .
i 1 0 1 3 .
i 1 0 1 4 .
i 1 0 1 5 .
i 1 0 1 6 .
</CsScore>
</CsoundSynthesizer>

Ciao,
fran.

Jacob Joaquin wrote:

I'm trying to finish an article I'm writing for the Csound Journal and
came across this issue. I'm hoping someone on the list can help clear
this up.

Is there a way to detect whether or not an f-table was declared with a
size of a power of two, a power of 2 + 1 or a negative number inside
of an instrument?  I discovered that ftlen ignores the guard point,
whether or not the guard point is implicitly or explicitly stated.
The following two f-tables have sizes of 4 and 5, though ftlen()
returns the value 4 for both:

f 1 0 4 -2 1 2 3 4
f 2 0 5 -2 1 2 3 4 5

I wrote a test csd that prints the size of the tables, along with the
values at each index.  Here is the output (F-table Index: Value):

__excerpt from output__
new alloc for instr 1:
Size of table 1: 4
0: 1.000000
1: 2.000000
2: 3.000000
3: 4.000000
4: 1.000000
new alloc for instr 1:
Size of table 2: 4
0: 1.000000
1: 2.000000
2: 3.000000
3: 4.000000
4: 5.000000
__end__

Other tests I ran show that negatively sized f-tables do not produce a
guard point.  Is this correct?

Here's the test csd I used:

__csd__
<CsoundSynthesizer>
<CsInstruments>
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1

instr 1
    ifn = p4
    ilast_index = p5
    isize = ftlen(ifn)
    ii = 0
    printf_i "Size of table %d: %d\n", 1, ifn, isize

    begin_loop:
    if (ii >= ilast_index) igoto end_loop
        ivalue tab_i ii, ifn
        printf_i "%d: %2f\n", 1, ii, ivalue
        ii = ii + 1
        igoto begin_loop

    end_loop:
    turnoff
endin
</CsInstruments>
<CsScore>
f 1 0 4 -2 1 2 3 4
f 2 0 5 -2 1 2 3 4 5
i 1 0 1 1 5
i 1 0 1 2 5
</CsScore>
</CsoundSynthesizer>
__end__


Best,
Jake
--
The Csound Blog - http://csound.noisepages.com/


Send bugs reports to this list.
To unsubscribe, send email [e-mail] with body "unsubscribe csound"