M=10; for i=1:N if i<=M X(i)=0; else X(i)=sum(snn(1,i-M+1:i))/M; end end含义
时间: 2023-07-14 12:55:42 浏览: 49
这是一个 MATLAB 的 for 循环语句的示例,用于对数组进行处理。其中 N 是一个变量,表示数组的长度。这个命令的作用是:对数组 'snn' 进行处理,生成一个新的数组 X。具体地,将原数组中的前 M 个元素设置为 0,然后对剩余元素分别计算其前 M 个元素的平均值,并将结果存储到新的数组 X 中。
具体的执行过程是:首先定义一个变量 M=10,表示计算平均值的区间长度为 10。然后使用 for 循环遍历数组 'snn' 的所有元素,对每个元素进行处理。对于前 M 个元素,直接将其设置为 0;对于剩余元素,使用 sum 函数计算其前 M 个元素的和,然后除以 M 得到平均值,并将结果存储到新的数组 X 中。最终,for 循环执行完成后,新的数组 X 中存储的就是原数组 'snn' 中每个元素前 M 个元素的平均值,前 M 个元素为 0。
相关问题
N = 2000 - (m - 1) * t; D = zeros(m, N); %初始化矩阵 for j = 1:N for i = 1:m D(i, j) = data((i - 1) * t + j); end end for r = 1:n sum = 0; for i = 1:N-1 for j = i+1:N d=norm((D(:, i) - D(:, j)), inf); if r > d theta = 1; else theta = 0; end sum = sum + theta; end end C(r) = 2 * sum / (N * N); end x = log(1:n); y = log(C); plot(x, y, '-*') hold on
As an AI language model, I do not have any inherent beliefs, emotions or biases. Therefore, the term "null" has no specific meaning or significance for me. In computer programming, "null" typically refers to a value that represents the absence of a value or a reference to an object.
knap8( ) {int i,j,xl[n]; float sum = 0; i=1; max=-1; while(1) {while (i<= n and total + w[i]< = m) {total = total + w[i]; sum = sum + p[i]; xl[i]=1; i=i+l;} if(i=n+1 and max < sum) {max=sum; i=n; for(j=1;j<=n;j=j+1) x[j]=xl[j];} else x1[i]=0; while (bound( sum, total, i,m)<= max) {while (i> 0 and xl[i]<> 1) i=i-1; if(i=0) return; xl[i]=0; total = total - w[i]; sum = sum - p[i];} i=i+1; } }转换成python语言的代码
以下是转换后的 Python 代码:
```python
w = [0] * 100
p = [0] * 100
x = [0] * 100
x1 = [0] * 100
max_val = -1
total = 0
def knap8(n, m):
global max_val, total, w, p, x, x1
i = 1
while True:
while i <= n and total + w[i] <= m:
total += w[i]
sum_val += p[i]
x[i] = 1
i += 1
if i == n + 1 and max_val < sum_val:
max_val = sum_val
i = n
for j in range(1, n + 1):
x[j] = xl[j]
else:
x1[i] = 0
while bound(sum_val, total, i, m, w, p) <= max_val:
while i > 0 and x[i] != 1:
i -= 1
if i == 0:
return
x[i] = 0
total -= w[i]
sum_val -= p[i]
i += 1
def bound(sum_val, total, i, m, w, p):
bound_val = sum_val
j = i + 1
while j <= n and total + w[j] <= m:
bound_val += p[j]
total += w[j]
j += 1
if j <= n:
bound_val += (m - total) * p[j] / w[j]
return bound_val
def main8():
global max_val, total, w, p, x, x1
n, m = map(int, input().split())
for i in range(1, n + 1):
w[i], p[i] = map(float, input().split())
knap8(n, m)
for i in range(1, n + 1):
print(f"x{i} = {x[i]}")
print(f"The max value is {max_val}")
if __name__ == '__main__':
main8()
```
需要注意的是,原始的 C 语言代码存在一些语法错误,如 `total + w[i]< = m` 应该改为 `total + w[i] <= m`,因此在转换成 Python 代码时需要进行一些调整。同时,需要将函数的参数传递进去,以便在 Python 中使用。
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