# 1. 数据库中的位置表 start_time = time.time() condi = 'Dataset="CALIOP_Apro_05KM"' sql = Create_select_sql('position',condition=condi) pos_df = get_data_from_sql(sql, con, recols={'id': 'Position_id'})[['Position_id', 'Latitude', 'Longitude']] print('THE COST to get position table:',time.strftime("%H: %M: %S",time.gmtime(time.time() - start_time))) std_index_2d, std_index_3d = get_std_coors(desday, posrange) start_time = time.time() othercon = 'Profile_Time >= "{}" and Profile_Time <"{}" and high_level > 338'.format(desday,tom_dt.strftime('%Y-%m-%d')) # apro_df 是[latitude,longitude,time,high_level,features]的格式,但是高度还没有std apro_ori, apro_df, apro_xr = get_apro_data_sql(con, apro_config, othercon, pos_merge=pos_df, multi_index=multi_index + ['high_level']) print('THE COST to get raw data table:',time.strftime("%H: %M: %S",time.gmtime(time.time() - start_time)))
时间: 2024-04-18 12:28:10 浏览: 13
这段代码包含了一些数据处理的步骤。让我逐一解释一下:
首先,代码使用Create_select_sql函数创建了一个查询语句,查询名为'position'的表中的一些数据。查询条件是'Dataset="CALIOP_Apro_05KM"'。然后,使用get_data_from_sql函数执行查询并将结果保存到pos_df变量中。
接下来,代码使用get_std_coors函数获取了std_index_2d和std_index_3d两个变量的值。这个函数可能用于计算标准化的坐标。
然后,代码使用get_apro_data_sql函数从数据库中获取apro_ori、apro_df和apro_xr这三个变量的值。这个函数可能根据给定的条件和配置从数据库中检索数据,并进行一些处理。
最后,代码打印了获取位置表和原始数据表所花费的时间。
请告诉我,如果你对这段代码还有其他问题或需要进一步解释的地方。
相关问题
Condi: !RET&(!DFTRAMBYP&((TENA&! QNAPA&! CENA)|(!TENA&!TONAPA&!TCENA)) IDFTRAMBYP) &EMAA[2]&EMAA[1]&EMAA[O]&EMASA Sub_whenw: !RET&!DFTRAMBYP&TENA&!TONAPAS!CENA&EMAA[2]&EMAA[1]&EMAA[0]&EMASA !RET&!DFTRAMBYP&!TENA&!TONAPA&!TCENA&EMAA[2]&EMAA[1]&EMAA[0]&EMASA !RET&DFTRAMBYP&EMAA[2]&EMAA[1]&EMAA[0]&EMASA condi: !RET&TENA&((DFTRAMBYP&!SEA)I(!DFTRAMBYP&!CENA)) sub_whenw: !RET&TENA&DFTRAMBYP&!SEA !RET&TENA&!DFTRAMBYP&!CENA 根据上面的cond使用perl转化成下面的sub_whenw,给出通用的代码设,the condi can split to sub_whenw by '|' , this is kind of de-morgon law appliment
Based on the given `cond` and `sub_whenw`, to split the `cond` by '|' and convert it to `sub_whenw` using De Morgan's law, you can use the following Perl code:
```
# split the cond by '|'
my @conditions = split /\|/, $cond;
# convert each condition to sub_whenw using De Morgan's law
my @sub_whenw;
foreach my $condition (@conditions) {
$condition =~ s/(\w+)/!$1/g; # negate all variables
$condition =~ s/\(/\(/g; # add back the opening parentheses
$condition =~ s/\)/\)/g; # add back the closing parentheses
$condition =~ s/!/~/g; # replace '!' with '~' for bitwise negation
my $sub = eval($condition); # evaluate the condition as a bitwise expression
$sub =~ s/(\d+)/$1 ? 'T' : 'F'/eg; # convert the bitwise result to 'T' or 'F'
push @sub_whenw, $sub;
}
# print the resulting sub_whenw
print join("\n", @sub_whenw);
```
This code first splits the `cond` by '|' into an array of individual conditions. It then loops through each condition and applies De Morgan's law by negating all variables, replacing '!' with '~' for bitwise negation, and evaluating the condition as a bitwise expression using `eval()`. Finally, it converts the bitwise result to 'T' or 'F' and adds the resulting `sub_whenw` to an array. The code then prints the resulting `sub_whenw` array.
matlab求分段函数组的值
在MATLAB中,可以使用piecewise函数来求解分段函数组的值。piecewise函数的语法如下:
```
y = piecewise(cond1,expr1,cond2,expr2,...,condN,exprN,default)
```
其中,cond1、cond2、...、condN是条件表达式,expr1、expr2、...、exprN是对应的表达式,default是默认表达式。当条件condi为真时,表达式expri被计算并返回结果。如果所有条件都为假,则返回默认表达式的结果。
例如,假设有一个分段函数组:
```
f(x) = x^2, x < 0
f(x) = x, 0 <= x < 1
f(x) = 2x - 1, x >= 1
```
可以使用piecewise函数来求解该函数组在x=0.5处的值:
```
syms x
f(x) = piecewise(x<0,x^2,0<=x<1,x,1<=x,2*x-1);
subs(f,0.5)
```
输出结果为:
```
ans = 0.5000
```
即f(0.5)=0.5。