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BartSMP [9]
3 years ago
11

Using the phase plane program, plot the phase plane for the Lotka-Volterra model:

Computers and Technology
1 answer:
ivanzaharov [21]3 years ago
7 0

Answer:

yes, the model gives a realistic behavior

Explanation:

This describes the inner equilibrium point is a stable node, here it's a center. These are periodic solutions. Populations of the mice and owls are periodic. It describes: when the mice population is lower, the owl population decreases; again the owl is lower so mice got a chance to grow its population; now as sufficient food(mice) is there, the owl population increases; as predator population increases, the prey population decreases; and this continues as a cycle forever.

So, yes, the model gives a realistic behavior.

Check attachment

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There is a simple method for constructing a magic square for any odd value of n:
DaniilM [7]

Answer:

See Explaination

Explanation:

class MagicSquare():

def __init__(self,side):

self.side=side

self.two_dimension=[]

for row in range(1,side+1):

row_line=[]

for col in range(1,side+1):

row_line.append(0)

self.two_dimension.append(row_line)

def display(self):

row=0

col=int((self.side-1)/2)

for i in range(1,self.side**2+1):

self.two_dimension[row][col]=i

row-=1

col+=1

if row==-1:

row=self.side-1

if col==self.side:

col=0

if self.two_dimension[row][col]==0:

continue

else:

row+=1

if row==self.side:

row==0

for line in self.two_dimension:

for num in line:

print("{0:>3}".format(num),end=" ")

print()

def main():

for i in range(1,14,2):

square=MagicSquare(i)

square.display()

print("----------------------------------------------------")

if __name__ == '__main__':

main()

3 0
3 years ago
What is APR?
omeli [17]

Answer:

APR is the Interest rate advertised by lenders.

Explanation:

APR is the annual percentage rate that is different from the interest rate. Interest rate is the rate of borrowing money. While APR is the rate which includes interest rate, processing fee and other cost that are involved in loan approving.

This cost is decided by lender, which may be equal to interest rate or greater than interest rate.

5 0
3 years ago
Write a multi-threaded program that outputs prime numbers. The program should work as follows: the user will run the program and
Ierofanga [76]

Answer:

The programming code can be found in the explanation part, please go through it.

Explanation:

Code:

#include<stdio.h>

#include<stdlib.h>

#include <pthread.h>

// function check whether a number

// is prime or not

int isPrime(int n)

{

// Corner case

if (n <= 1)

return 0;

// Check from 2 to n-1

for (int i = 2; i < n; i++)

if (n % i == 0)

return 0;

return 1;

}

void* printPrimes(void *vargp)

{

int *n = (int *)vargp;

int i=0;

for (i=2;i<=n;i++)

{

if (isPrime(i)) printf("%d\n", i);

}

}

// Driver Program

int main(int argc, char* argv[])

{

int n = atoi(argv[1]);

pthread_t tid;

pthread_create(&tid, NULL, printPrimes, (void *)n);

pthread_exit(NULL);

return 0;

}

4 0
3 years ago
An international package shipping company like FedEx needs to be able to track the location of every package at every stage in t
Luba_88 [7]

Answer:

<em>The specific type of software useful in this situation would be a ship manager software. </em>

Explanation:

<em>It is a stand alone, user installable, windows-based software package designed to allow the quickly ship, track, and report the daily activities.</em>

<em>In addition to managing shipment information, the software keeps the details of the operation, so that the user can easily retrieve necessary information about his shipments.</em>

8 0
3 years ago
Read 2 more answers
arla made a spreadsheet in Excel showing the projected costs for a concert she was putting on. What can Marla enter into cell A1
svp [43]

Marla can enter Food for examble for A11 on the exl page

3 0
3 years ago
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