英文:
How do I use array data from 'request.security_lower_tf' to generate an ema/a plot in Pinescript?
问题
I want to generate several EMAs, calculated using bars from different timeframes (lower than the chart's timeframe e.g using 1m candle closes on a 5m chart). How do I convert the array from 'request.security_lower_tf' into a form suitable for an MA calculation or a plot?
我想生成多个指数移动平均线（EMA），使用不同时间框架的K线计算（比图表时间框架低，例如在5分钟图上使用1分钟蜡烛收盘价）。我如何将来自'request.security_lower_tf'的数组转换为适用于MA计算或绘图的形式？
I'm trying to use the 'request.security_lower_tf' command to fetch data from lower timeframes but when I input it into a calculation I keep getting the following error in my 'ta.ema()' calculation: "Cannot call 'ta.ema()' with argument 'data'. An argument of 'float[]' type was used but a 'series float' is expected".
我试图使用'request.security_lower_tf'命令从较低的时间框架获取数据，但当我将其输入到计算中时，我不断收到以下错误消息：“无法使用参数'data'调用'ta.ema()'。 使用了'float[]'类型的参数，但期望的是'series float'”。
Here is my code so far:
以下是迄今为止的我的代码：
//@version=5
indicator("MTF EMA")
// 设置输入变量
emaLength = input.int(20, title="EMA Length 1")
// 从较低时间框架获取数据
data = request.security_lower_tf(syminfo.tickerid, "D", close)
// 计算EMA
ema1 = ta.ema(data, emaLength)
// 绘制EMA
plot(ema1, color=color.blue, title="EMA 1")
英文:
I want to generate several EMAs, calculated using bars from different timeframes (lower than the chart's timeframe e.g using 1m candle closes on a 5m chart). How do I convert the array from 'request.security_lower_tf' into a form suitable for an MA calculation or a plot?
I'm trying to use the 'request.security_lower_tf' command to fetch data from lower timeframes but when I input it into a calculation I keep getting the following error in my 'ta.ema()' calculation: "Cannot call 'ta.ema()' with argument 'data'. An argument of 'float[]' type was used but a 'series float' is expected".
Here is my code so far:
//@version=5
indicator("MTF EMA")
// Set the input variables
emaLength = input.int(20, title="EMA Length 1")
// Fetch data from lower timeframe
data = request.security_lower_tf(syminfo.tickerid, "D", close)
// Calculate the EMAs
ema1 = ta.ema(data, emaLength)
// Plot the EMAs
plot(ema1, color=color.blue, title="EMA 1")
答案1
得分: 0
request.security_lower_tf() 返回一个数组，所以你应该使用 array.get() 函数。你应该小心不要尝试访问数组的边界之外的元素。因此，你可以进行大小检查。
// 从较低时间框架获取数据
data = request.security_lower_tf(syminfo.tickerid, "D", close)
data_size = array.size(data)
float close1 = (data_size > 0) ? array.get(data, 0) : na
// 计算指数移动平均线（EMAs）
ema1 = ta.ema(close1, emaLength)
英文:
request.security_lower_tf() returns an array so you should use the array.get() function. You should be careful about not trying to access beyond the boundaries of the array. Therefore, you can do a size check.
// Fetch data from lower timeframe
data = request.security_lower_tf(syminfo.tickerid, "D", close)
data_size = array.size(data)
float close1 = (data_size > 0) ? array.get(data, 0) : na
// Calculate the EMAs
ema1 = ta.ema(close1, emaLength)
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