if(is_numeric($b)){ exit();
时间: 2023-12-16 21:06:16 浏览: 36
这段代码的作用是判断变量 `$b` 的值是否为数字。如果 `$b` 是一个数字,那么 `is_numeric($b)` 的返回值为真(true),进入条件语句块。在条件语句块中,`exit()` 函数会立即终止当前脚本的执行。
`exit()` 函数用于终止 PHP 脚本的执行,并返回一个指定的退出码。在这种情况下,没有指定退出码,因此脚本将以默认的退出码退出。
这段代码的作用可能是在某种条件下,如果 `$b` 不是一个数字,就立即终止脚本的执行。具体的逻辑和用途需要根据代码上下文来确定。
相关问题
优化代码 def cluster_format(self, start_time, end_time, save_on=True, data_clean=False, data_name=None): """ local format function is to format data from beihang. :param start_time: :param end_time: :return: """ # 户用簇级数据清洗 if data_clean: unused_index_col = [i for i in self.df.columns if 'Unnamed' in i] self.df.drop(columns=unused_index_col, inplace=True) self.df.drop_duplicates(inplace=True, ignore_index=True) self.df.reset_index(drop=True, inplace=True) dupli_header_lines = np.where(self.df['sendtime'] == 'sendtime')[0] self.df.drop(index=dupli_header_lines, inplace=True) self.df = self.df.apply(pd.to_numeric, errors='ignore') self.df['sendtime'] = pd.to_datetime(self.df['sendtime']) self.df.sort_values(by='sendtime', inplace=True, ignore_index=True) self.df.to_csv(data_name, index=False) # 调用基本格式化处理 self.df = super().format(start_time, end_time) module_number_register = np.unique(self.df['bat_module_num']) # if registered m_num is 0 and not changed, there is no module data if not np.any(module_number_register): logger.logger.warning("No module data!") sys.exit() if 'bat_module_voltage_00' in self.df.columns: volt_ref = 'bat_module_voltage_00' elif 'bat_module_voltage_01' in self.df.columns: volt_ref = 'bat_module_voltage_01' elif 'bat_module_voltage_02' in self.df.columns: volt_ref = 'bat_module_voltage_02' else: logger.logger.warning("No module data!") sys.exit() self.df.dropna(axis=0, subset=[volt_ref], inplace=True) self.df.reset_index(drop=True, inplace=True) self.headers = list(self.df.columns) # time duration of a cluster self.length = len(self.df) if self.length == 0: logger.logger.warning("After cluster data clean, no effective data!") raise ValueError("No effective data after cluster data clean.") self.cluster_stats(save_on) for m in range(self.mod_num): print(self.clusterid, self.mod_num) self.module_list.append(np.unique(self.df[f'bat_module_sn_{str(m).zfill(2)}'].dropna())[0])
Here are some possible optimizations for the given code:
1. Instead of using a list comprehension to find columns with 'Unnamed' in their names, you can use the `filter()` function along with a lambda function to achieve the same result in a more concise way:
```
unused_index_col = list(filter(lambda x: 'Unnamed' in x, self.df.columns))
```
2. Instead of dropping duplicates and resetting the index separately, you can use the `drop_duplicates()` function with the `ignore_index` parameter set to `True` to achieve both in one step:
```
self.df.drop_duplicates(inplace=True, ignore_index=True)
```
3. Instead of using `sys.exit()` to terminate the program when there is no module data, you can raise a `ValueError` with an appropriate error message:
```
raise ValueError("No module data!")
```
4. Instead of using a series of `if` statements to find the voltage reference column, you can use the `loc` accessor with a boolean mask to select the first column that starts with 'bat_module_voltage':
```
volt_ref_col = self.df.columns[self.df.columns.str.startswith('bat_module_voltage')][0]
```
5. Instead of using a loop to append a single item to a list, you can use the `append()` method directly:
```
self.module_list.append(np.unique(self.df[f'bat_module_sn_{str(m).zfill(2)}'].dropna())[0])
```
By applying these optimizations, the code can become more concise and efficient.
if (is.null(sub.caption)) { cal <- x$call if (!is.na(m.f <- match("formula", names(cal)))) { cal <- cal[c(1, m.f)] names(cal)[2L] <- "" } cc <- deparse(cal, 80) nc <- nchar(cc[1L], "c") abbr <- length(cc) > 1 || nc > 75 sub.caption <- if (abbr) paste(substr(cc[1L], 1L, min(75L, nc)), "...") else cc[1L] } place_ids <- function(x_coord, y_coord, offset, dif_pos_neg){ extreme_points <- as.vector(Rfast::nth(abs(y_coord), k = id.n, num.of.nths = id.n, index.return = TRUE, descending = TRUE)) if(dif_pos_neg){ idx_x_pos <- extreme_points[which(y_coord[extreme_points] >= 0)] idx_x_neg <- setdiff(extreme_points, idx_x_pos) idx_y_pos <- y_coord[idx_x_pos] idx_y_neg <- y_coord[idx_x_neg] idx_x_pos_id <- x_coord[idx_x_pos] idx_x_neg_id <- x_coord[idx_x_neg] if(length(idx_x_pos)>0){ graphics::text(idx_x_pos_id, idx_y_pos, labels = labels.id[idx_x_pos], col = col.id, cex = cex.id, xpd = TRUE, pos = 3, offset = offset) } if(length(idx_x_neg)>0){ graphics::text(idx_x_neg_id, idx_y_neg, labels = labels.id[idx_x_neg], col = col.id, cex = cex.id, xpd = TRUE, pos = 1, offset = offset) } } else{ idx_x <- extreme_points idx_y <- y_coord[idx_x] idx_x_id <- x_coord[idx_x] labpos <- label.pos[1 + as.numeric(idx_x_id > mean(range(x_coord)))] graphics::text(idx_x_id, idx_y, labels = labels.id[idx_x], col = col.id, cex = cex.id, pos = labpos, xpd = TRUE, offset = offset) } } one.fig <- prod(graphics::par("mfcol")) == 1 if (ask) { oask <- grDevices::devAskNewPage(TRUE) on.exit(grDevices::devAskNewPage(oask)) }
这段代码看起来也是 R 语言中的函数,但是和之前的代码段不是同一个函数。这个函数开始首先判断 sub.caption 是否为 NULL,如果是,则生成一个子标题 sub.caption。生成子标题的过程中,函数会获取对象 x 的调用 cal,并根据其是否包含 formula 来生成简略或详细的调用字符串 cc。如果 cc 的长度大于 1 或者第一个字符串长度大于 75,则将其缩写成不超过 75 个字符的字符串并加上省略号,否则直接使用 cc。接下来,函数调用了另一个函数 place_ids,将标签和标识符的位置绘制在图形中。最后,在设置 ask 为 TRUE 的情况下,函数使用 devAskNewPage 函数设置交互模式,以便在绘制每个图之前提示用户进行交互。
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