Hi all
I am experimenting with my own python block. I started by simply
interrogating each variable to see their types and shapes.
I connected a vector source that just generates increasing numbers (0, 1,
2, 3, 4, 5 and so on upto a big number).
I noticed that the length of (input_items[0]) seems to oscillate between
4096 and 4095 in successive work calls. I also noticed that in each work
call, a NEW set of samples appear. (attached file)
Here are my questions:
If I were just doing something really simple like squaring each element, in
each work call I'd just square every element in the vector input_items[0].
No problem.
Suppose I need to do an FFT. (I know it can be done with stream to vector
followed by FFT) But suppose I wanted to make it work with streams.
In each work call, I’d divide the input_items[0] vector into chunks of size
= FFT size and take the FFT of each chunk. Again no problem. Since 4096
will divide perfectly by a power of 2 FFT size.
But what about the case when I have 4095? If I do FFT = 512, I will get 7
chunks of 512 and I will be left over with 511. Would I have to save those
511 elements and use them in the next work call when input_items[0] gets
new elements?
Thanks
Anil
Work call: 0
Length of input in current work call: 4096
First few elements in in0 in current work call: [ 0.+0.j 1.+0.j 2.+0.j
3.+0.j 4.+0.j]
Last few elements in in0 in current work call: [ 4091.+0.j 4092.+0.j
4093.+0.j 4094.+0.j 4095.+0.j]
Work call: 1
Length of input in current work call: 4095
First few elements in in0 in current work call: [ 4096.+0.j 4097.+0.j
4098.+0.j 4099.+0.j 4100.+0.j]
Last few elements in in0 in current work call: [ 8186.+0.j 8187.+0.j
8188.+0.j 8189.+0.j 8190.+0.j]
Work call: 2
Length of input in current work call: 4096
First few elements in in0 in current work call: [ 8191.+0.j 8192.+0.j
8193.+0.j 8194.+0.j 8195.+0.j]
Last few elements in in0 in current work call: [ 12282.+0.j 12283.+0.j
12284.+0.j 12285.+0.j 12286.+0.j]
Work call: 3
Length of input in current work call: 4095
First few elements in in0 in current work call: [ 12287.+0.j 12288.+0.j
12289.+0.j 12290.+0.j 12291.+0.j]
Last few elements in in0 in current work call: [ 16377.+0.j 16378.+0.j
16379.+0.j 16380.+0.j 16381.+0.j]
Work call: 4
Length of input in current work call: 4096
First few elements in in0 in current work call: [ 16382.+0.j 16383.+0.j
16384.+0.j 16385.+0.j 16386.+0.j]
Last few elements in in0 in current work call: [ 20473.+0.j 20474.+0.j
20475.+0.j 20476.+0.j 20477.+0.j]
Work call: 5
Length of input in current work call: 4095
First few elements in in0 in current work call: [ 20478.+0.j 20479.+0.j
20480.+0.j 20481.+0.j 20482.+0.j]
Last few elements in in0 in current work call: [ 24568.+0.j 24569.+0.j
24570.+0.j 24571.+0.j 24572.+0.j]
Work call: 6
Length of input in current work call: 4096
First few elements in in0 in current work call: [ 24573.+0.j 24574.+0.j
24575.+0.j 24576.+0.j 24577.+0.j]
Last few elements in in0 in current work call: [ 28664.+0.j 28665.+0.j
28666.+0.j 28667.+0.j 28668.+0.j]
Work call: 7
Length of input in current work call: 4095
First few elements in in0 in current work call: [ 28669.+0.j 28670.+0.j
28671.+0.j 28672.+0.j 28673.+0.j]
Last few elements in in0 in current work call: [ 32759.+0.j 32760.+0.j
32761.+0.j 32762.+0.j 32763.+0.j]
Work call: 8
Length of input in current work call: 4096
First few elements in in0 in current work call: [ 32764.+0.j 32765.+0.j
32766.+0.j 32767.+0.j 32768.+0.j]
Last few elements in in0 in current work call: [ 36855.+0.j 36856.+0.j
36857.+0.j 36858.+0.j 36859.+0.j]
Work call: 9
Length of input in current work call: 4095
First few elements in in0 in current work call: [ 36860.+0.j 36861.+0.j
36862.+0.j 36863.+0.j 36864.+0.j]
Last few elements in in0 in current work call: [ 40950.+0.j 40951.+0.j
40952.+0.j 40953.+0.j 40954.+0.j]
Work call: 10
Length of input in current work call: 4096
First few elements in in0 in current work call: [ 40955.+0.j 40956.+0.j
40957.+0.j 40958.+0.j 40959.+0.j]
Last few elements in in0 in current work call: [ 45046.+0.j 45047.+0.j
45048.+0.j 45049.+0.j 45050.+0.j]
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