Question

您好我正在尝试在MATLAB上执行此操作

A =

64     2     3    61    60     6     7    57
 9    55    54    12    13    51    50    16
17    47    46    20    21    43    42    24
40    26    27    37    36    30    31    33
32    34    35    29    28    38    39    25
41    23    22    44    45    19    18    48
49    15    14    52    53    11    10    56
 8    58    59     5     4    62    63     1

我想根据F

从A中选择值

F =

 0     0     0     0     0     0     0     0
 0     0     0     0     0     0     0     0
 0     0     0     0     0     0     0     0
-1    -1    -1    -1    -1    -1    -1    -1
 0     0     0     0     0     0     0     0
-1    -1    -1    -1    -1    -1    -1    -1
-1    -1    -1    -1    -1    -1    -1    -1
-1    -1    -1    -1    -1    -1    -1    -1

我想要这个输出

u =

40    26    27    37    36    30    31    33
41    23    22    44    45    19    18    48
49    15    14    52    53    11    10    56
 8    58    59     5     4    62    63     1

这意味着我希望矩阵中的所有值都对应于'-1'。我试过你= A（F == - 1）......但它给了我一个包含所有这些值的列：

u =

Answer 1

这样做： -

with
     inputs ( seq, str ) as ( 
       select 1, 'alpha:"123.k"..."myField":{"$bigdec":"1.23"} and others' 
       from   dual
     ),
     nbr    ( seq, n ) as (
       select seq, 
              regexp_substr(str, '"myField":{"\$bigdec":"(\d+\.?\d*)"}', 1, 1, null, 1) 
       from   inputs
     ),
     repl   ( seq, r_str ) as (
       select seq, to_char( round(power(to_number(n), 3), 2), 'fm99999999.99') 
       from   nbr
     )
select i.seq, i.str,
       regexp_replace(i.str, '"myField":{"\$bigdec":"\d+\.\d*"}', 
                               '"myField":{"\$bigdec":"' || r.r_str || '"}') as repl_str
from   inputs i inner join repl r on i.seq = r.seq
;

 SEQ STR                                                      
---- ---------------------------------------------------------
   1 alpha:"123.k"..."myField":{"$bigdec":"1.23"} and others

                                  REPL_STR
                                  --------------------------------------------------------
                                  alpha:"123.k"..."myField":{"\$bigdec":"1.86"} and others

另一种解决方案： -

u=-A.*F;               
u(all(u==0,2),:)=[]    %Removing rows containing zeros

在MATLAB中基于另一个矩阵值复制矩阵值

1 个答案: