multidimensional-array

问题 This question already has answers here : Numpy array loss of dimension when masking (4 answers) Closed 9 months ago . The question sounds very basic. But when I try to use where or boolean conditions on numpy arrays, it always returns a flattened array. I have the NumPy array P = array([[ 0.49530662, 0.07901 , -0.19012371], [ 0.1421513 , 0.48607405, -0.20315014], [ 0.76467375, 0.16479826, -0.56598029], [ 0.53530718, -0.21166188, -0.08773241]]) I want to extract the array of only negative

问题 Consider this code: #include <stdio.h> #define N 5 void printMatrix(int (*matrix)[N],int n) { int i,j; for(i=0;i<n;i++){ for(j=0;j<n;j++) printf("%d",matrix[i][j]); printf("\n"); } } int main() { int R[N][N]={{1,2,3},{4,5,6},{7,8,9}}; printMatrix(R,3); } This works fine as expected. Now, I thought to write the functions handling 2D-matrices in a separate source file and link them wherever required. But then I ran into a problem as in the function printMatrix , the size of array of int to

问题 Consider this code: #include <stdio.h> #define N 5 void printMatrix(int (*matrix)[N],int n) { int i,j; for(i=0;i<n;i++){ for(j=0;j<n;j++) printf("%d",matrix[i][j]); printf("\n"); } } int main() { int R[N][N]={{1,2,3},{4,5,6},{7,8,9}}; printMatrix(R,3); } This works fine as expected. Now, I thought to write the functions handling 2D-matrices in a separate source file and link them wherever required. But then I ran into a problem as in the function printMatrix , the size of array of int to

问题 I am using PHP & I have a multi dimensional array which I need to search to see if the value of a "key" exists and if it does then get the value of the "field". Here's my array: Array ( [0] => Array ( [key] => 31 [field] => CONSTRUCTN [value] => LFD_CONSTRUCTION_2 ) [1] => Array ( [key] => 32 [field] => COOLING value] => LFD_COOLING_1 ) ) I want to be able to search the array for the "key" value of 31. If it exists, then I want to be able to extract the corresponding "field" value of

问题 I'm trying to create a keras LSTM to predict time series. My x_train is shaped like 3000,15,10 (Examples, Timesteps, Features), y_train like 3000,15,1 and I'm trying to build a many to many model (10 input features per sequence make 1 output / sequence). The code I'm using is this: model = Sequential() model.add(LSTM( 10, input_shape=(15, 10), return_sequences=True)) model.add(Dropout(0.2)) model.add(LSTM( 100, return_sequences=True)) model.add(Dropout(0.2)) model.add(Dense(1, activation=

问题 I'm trying to create a keras LSTM to predict time series. My x_train is shaped like 3000,15,10 (Examples, Timesteps, Features), y_train like 3000,15,1 and I'm trying to build a many to many model (10 input features per sequence make 1 output / sequence). The code I'm using is this: model = Sequential() model.add(LSTM( 10, input_shape=(15, 10), return_sequences=True)) model.add(Dropout(0.2)) model.add(LSTM( 100, return_sequences=True)) model.add(Dropout(0.2)) model.add(Dense(1, activation=

问题 I'm trying to create a keras LSTM to predict time series. My x_train is shaped like 3000,15,10 (Examples, Timesteps, Features), y_train like 3000,15,1 and I'm trying to build a many to many model (10 input features per sequence make 1 output / sequence). The code I'm using is this: model = Sequential() model.add(LSTM( 10, input_shape=(15, 10), return_sequences=True)) model.add(Dropout(0.2)) model.add(LSTM( 100, return_sequences=True)) model.add(Dropout(0.2)) model.add(Dense(1, activation=

问题 I'm trying to understand how to set a column of a two dimensional array to 0. I follow this code snippet from C programming textbook by K.N. King. int a[NUM_ROWS][NUM_COLS], (*p)[NUM_COLS], i; ... for (p = &a[0]; p < &a[NUM_ROWS]; p++) (*p)[i] = 0; I genuinely don't understand how this works. Greatly appreciate any clarification. 回答1: It's all related to how an array is converted to a pointer on access, see: C11 Standard - 6.3.2.1 Other Operands - Lvalues, arrays, and function designators(p3)

问题 I'm trying to understand how to set a column of a two dimensional array to 0. I follow this code snippet from C programming textbook by K.N. King. int a[NUM_ROWS][NUM_COLS], (*p)[NUM_COLS], i; ... for (p = &a[0]; p < &a[NUM_ROWS]; p++) (*p)[i] = 0; I genuinely don't understand how this works. Greatly appreciate any clarification. 回答1: It's all related to how an array is converted to a pointer on access, see: C11 Standard - 6.3.2.1 Other Operands - Lvalues, arrays, and function designators(p3)

问题 I have a multi-dimensional array of string . I am willing to convert it into some collection type, so that I can add, remove and insert elements according my wish. In array I can not remove element at particular position. I need such collection in which I can remove data at particular position, also able to add data at any position. Also dont forget I have multi-dimension array, so the collection should also able to store multidimensional data. Which collection will be suitable for my