ai 프로그래밍 넘파이 함수 직접 만들기

표준편차

def std_self(list,axis = 3):
    result = []
    sum = 0
    if axis == 3:
        for i in range(len(list)):
            for j in range(len(list[0])):
                sum += list[i][j]
        mean = sum / (len(list) * len(list[0]))
        sum = 0
        for i in range(len(list)):
            for j in range(len(list[0])):
                sum += (mean - list[i][j])**2
        return (sum/(len(list)*len(list[0])))**0.5
    elif axis == 1 or  axis == -1:
        for i in range(len(list)):
            sum = 0
            for j in range(len(list[0])):
                sum += list[i][j]
            mean = (sum/len(list[0]))
            sum = 0
            for j in range(len(list[0])):
                sum += (mean - list[i][j])**2
            result.append((sum/len(list[0]))**0.5)
        return result
    elif axis == 0 or axis == -2:
        for j in range(len(list[0])):
            sum = 0
            for i in range(len(list)):
                sum += list[i][j]
            mean = sum/len(list)
            sum = 0
            for i in range(len(list)):
                sum += (mean - list[i][j])**2
            result.append((sum/len(list))**0.5)
        return result​

최소값의 index 찾기

def argmin_self(list,axis = 3):
    result = []
    answer = 0
    if axis == 3:
        temp = list[0][0]
        for i in range(len(list)):
            for j in range(len(list[0])):
                if list[i][j] < temp:
                    temp = list[i][j]
                    answer = i + j
        return answer
    elif axis == 1 or axis == -1:
        for i in range(len(list)):
            temp = list[i][0]
            for j in range(len(list[0])):
                if list[i][j] < temp:
                    temp = list[i][j]
                    answer = i + j
            result.append(answer)
        return result
    elif axis == 0 or axis == -2:
        for j in range(len(list[0])):
            temp = list[0][j]
            for i in range(len(list)):
                if list[i][j] < temp:
                    temp = list[i][j]
                    answer = i + j
            result.append(answer)
        return result

평균 구하기

def mean_self(list,axis = 3):
    result = []
    sum = 0
    if axis == 3:
        for i in range(len(list)):
            for j in range(len(list[0])):
                sum += list[i][j]
        return sum / (len(list) * len(list[0]))
    elif axis == 1 or  axis == -1:
        for i in range(len(list)):
            sum = 0
            for j in range(len(list[0])):
                sum += list[i][j]
            result.append(sum/len(list[0]))
        return result
    elif axis == 0 or axis == -2:
        for j in range(len(list[0])):
            sum = 0
            for i in range(len(list)):
                sum += list[i][j]
            result.append(sum/len(list))
        return result