得到与"iterMax"有关的错误"spatstat :: density"功能. [英] getting error `spatstat::density` function related to "iterMax"

问题描述

R中density函数的错误提示:时间迭代次数超过iterMax；增加dtt或增加iterMax"

Help with error "No of time iterations exceeds iterMax; increase dtt or increase iterMax" for density function in R

如何增加iterMax?

How do I increase the iterMax?

我正在使用库spatstat.

I am using the library spatstat.

这是我的脚本:

d660<-密度(unmark(control23_network.ppp)，660)

d660 <- density(unmark(control23_network.ppp), 660)

我在线性网络上的Point模式具有:

My Point pattern on linear network has:

1969点 具有20126顶点和21363线的线性网络 封闭窗口:矩形= [-87.63141，-87.55547] x [41.75817，41.83858]单位

1969 points Linear network with 20126 vertices and 21363 lines Enclosing window: rectangle = [-87.63141, -87.55547] x [41.75817, 41.83858] units

在spatstat库中具有示例数据集的示例如下:

An example of it working is in the spatstat library with sample dataset:

数据(芝加哥)

芝加哥

d60<-密度(unmark(芝加哥)，60)

d60 <- density(unmark(chicago), 60)

图(d60)

d60

此样本数据集具有:

线性网络上的点模式 116点 多种类型，可能的类型:袭击，入室盗窃，盗窃，损坏，抢劫，盗窃，侵入 具有338个顶点和503条线的线性网络 封闭窗口:矩形= [0.3894，1281.9863] x [153.1035，1276.5602]英尺

Point pattern on linear network 116 points Multitype, with possible types: assault, burglary, cartheft, damage, robbery, theft, trespass Linear network with 338 vertices and 503 lines Enclosing window: rectangle = [0.3894, 1281.9863] x [153.1035, 1276.5602] feet

推荐答案

这是关于spatstat::density.lpp的问题，spatstat::density.lpp是线性网络上点模式(类lpp)的density方法.

This is a question about spatstat::density.lpp, the method for density for point patterns on a linear network (class lpp).

所选带宽sigma太大.包围的矩形大约为0.1个单位宽，而带宽为sigma=660个单位.这将需要大量重复的算法，因此它拒绝了.

The chosen bandwidth sigma is far too large. The enclosing rectangle is about 0.1 units wide, while the bandwidth is sigma=660 units. This would require a prohibitively large number of iterations of the algorithm, so it refuses.

在此示例中，带宽sigma的合理值应在0.001到0.05个单位之间.

A reasonable value of bandwidth sigma in this example would be between 0.001 and 0.05 units.

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