We can convert cartesian coordinates to polar coordinates and vice-versa using the following formulae The following figure shows the two coordinate systems in the same plane, which will help you understand the relationship between them better. Now that we understand the polar coordinate system and i...
Write a NumPy program to convert cartesian coordinates to polar coordinates of a random 10x2 matrix representing cartesian coordinates. Expected Output: [ 0.89225122 0.68774813 0.20392039 1.22093243 1.24435921 1.00358852 0.37378547 0.8534585 0.31999648 0.567451 ] ...
运行结果: 44. Consider a random 10x2 matrix representing cartesian coordinates, convert them to polar coordinates (★★☆) 1arr = np.random.randint(1,10,(10,2))2x =arr[:,0]3y = arr[:,1]4R = np.sqrt(x**2+y**2)5T =np.arctan2(y,x)6print(R)7print(T) 运行结果: [ 8.94427...
4. How to find the memory size of any array (★☆☆) data = np.arange(50000000) %time print(u'方法一: ', data.nbytes) %time print(u'方法二: ', data.size*data.itemsize) # 也可以使用python内置的方法,不过效率估计会低一些 from sys import getsizeof %time print(u'方法三: ', get...
44. Consider a random 10x2 matrix representing cartesian coordinates, convert them to polar coordinates (★★☆) (hint: np.sqrt, np.arctan2) 45. Create random vector of size 10 and replace the maximum value by 0 (★★☆) (hint: argmax) ...
44.Consider a random 10x2 matrix representing cartesian coordinates, convert them to polar coordinates (★★☆) Z = np.random.random((10,2)) X,Y = Z[:,0], Z[:,1] R = np.sqrt(X**2+Y**2) T = np.arctan2(Y,X) print(R) ...
41. How to sum a small array faster than np.sum? (★★☆) 42. Consider two random array A and B, check if they are equal (★★☆) 43. Make an array immutable (read-only) (★★☆) 44. Consider a random 10x2 matrix representing cartesian coordinates, convert them to polar coordin...
41. How to sum a small array faster than np.sum? 42. Consider two random array A and B, check if they are equal 43. Make an array immutable (read-only) 44. Consider a random 10x2 matrix representing cartesian coordinates, convert them to polar coordinates ...
44. Consider a random 10x2 matrix representing cartesian coordinates, convert them to polar coordinates (★★☆) 45. Create a random vector of size 10 and replace the maximum value by 0 (★★☆) 46. Create a structured array with x and y coordinates covering the [0,1]x[0,1] area (...
flags.writeable = False # Z[0] =1 # ValueError: assignment destination is read-only """ Consider a random 10x2 matrix representing cartesian coordinates, convert them to polar coordinates (★★☆) 距离计算式是p=sqrt(x^2+y^2),角度计算式arctan(y/x) """ Z = np.random.random((10,2...