Prolog Common Differences, Next Number in Polynomial Sequence
By : user3055771
Date : March 29 2020, 07:55 AM
this one helps. You have a typo in your nextitem rule, NextI should be casesensitive and you have it as nextI in the definition. Also, do you need the list brackets around [Z], rowbelow results in a list for that operand, so they are not needed. So you end up with: code :
nextitem([AB], NextI):lastitem([AB],X),
rowbelow([AB],Z),lastitem(Z,Y), NextI is X+Y.
nextitem([],0).
nextitem([AB], NextI):lastitem([AB],X), rowbelow([AB],Z), nextitem(Z,Y), NextI is X+Y.
nextitem([A],A).
nextitem([],0).

How to use apply to create multiple polynomial variables?
By : Imogen.ds
Date : March 29 2020, 07:55 AM
hope this fix your issue I have several variables, , We can make use of a named vector to change the values to numeric code :
newdata < combi[qual_cols]
newdata[] < lapply(combi[qual_cols], function(x)
setNames(c(1, 2, 4, 6, 11), grades)[x])
nm1 < grep("(CondQual)$", names(newdata), value = TRUE)
nm2 < sub("[AZ][az]+$", "", nm1)
nm3 < paste0(unique(nm2), 'Grade')
newdata[nm3] < lapply(split.default(newdata[nm1], nm2), function(x) Reduce(`*`, x))
set.seed(24)
combi < as.data.frame(matrix(sample(grades, 10 * 5, replace = TRUE),
ncol = 10, dimnames = list(NULL, qual_cols)), stringsAsFactors = FALSE)

CRC implementing a specific polynomial. How does the polynomial relate to the polynomial used in code?
By : hildegard
Date : March 29 2020, 07:55 AM
may help you . I have the following CRC function: , How does 0x18 relate to the polynomial X^8+X^5+X^4+X^0? code :
typedef unsigned char uint8_t;
typedef unsigned short uint16_t;
#define CRC8INIT 0x00
#define CRC8POLY 0x8c // 0x119 >> 1
uint8_t crc8 (uint8_t *data, uint16_t number_of_bytes_in_data)
{
uint8_t crc;
uint16_t loop_count;
uint8_t bit_counter;
uint8_t b;
uint8_t feedback_bit;
crc = CRC8INIT;
for (loop_count = 0; loop_count != number_of_bytes_in_data; loop_count++) {
b = data[loop_count];
bit_counter = 8;
do {
feedback_bit = (crc ^ b) & 0x01;
crc = (crc >> 1) ^ ((0feedback_bit) & CRC8POLY);
b = b >> 1;
bit_counter;
} while (bit_counter > 0);
}
return crc;
}

I expected a `numpy.lib.polynomial.poly1d` object, I've found a sequence of integers
By : Grant
Date : March 29 2020, 07:55 AM
I wish this helpful for you , A poly1d object is iterable code :
In [1]: np.poly1d((3,2))
Out[1]: poly1d([3, 2])
In [2]: list(_)
Out[2]: [3, 2]
In [12]: arr = np.empty(2, object)
In [13]: arr[:] = [np.poly1d((3,2)), np.poly1d((4,2))]
In [14]: arr
Out[14]: array([poly1d([3, 2]), poly1d([4, 2])], dtype=object)
In [17]: np.array([np.poly1d((3,2)), np.poly1d((3,2,1))])
Out[17]: array([poly1d([3, 2]), poly1d([3, 2, 1])], dtype=object)
In [18]: np.array([np.poly1d((3,2,1)), np.poly1d((3,2,1))])

ValueError Traceback (most recent call last)
<ipythoninput1800b20d14a2b6> in <module>
> 1 np.array([np.poly1d((3,2,1)), np.poly1d((3,2,1))])
ValueError: cannot copy sequence with size 2 to array axis with dimension 3

Finding a polynomial formula for sequence of numbers
By : user2930301
Date : March 29 2020, 07:55 AM

