将值附加到导出的 .dat 的最快方法

发布于 2024-12-29 21:06:49 字数 845 浏览 5 评论 0原文

我目前正在尝试编写一个小型导出函数，但是在尝试获取正确的导出格式时遇到了问题。 LoadElements 函数仅生成系统列表（包含 200 个配对元素）。

elements = Table[LoadElements[X], {10}];
Export["C:\\Exports\\elements.dat", elements]

这样我就得到了所需的格式并且功能很快：对于每个列表一个新行；示例：
{列表1元素1，列表1元素2...}
{列表2元素1，列表2元素2...}
问题是：使用导出功能，我无法将新值附加到文件中。

比我尝试使用流：但是：1.它比导出代码慢得多，2.我没有获得正确的格式：

Do[
file = OpenAppend["C:\\Exports\\elements.dat", PageWidth -> Infinity];
Write[file, elemnts = Table[LoadElements[X], {2}]];
Close[file];
, {2}];

需要PageWidth Infinity，因为否则会出现换行符，但它给了我以下格式：
{列表1}{列表2}
{列表3}{列表4}
而且速度相当慢..

我将感谢一个想法，如何能够轻松地将值附加到具有所需表格格式的文件中..

非常感谢，它通常有效。

不幸的是，这会在每对值之间产生一个额外的空换行符，知道为什么吗？所以这会产生：
结果对

结果对
而不是：
结果对
结果对
我的意思是我可以用另一个脚本手动删除空行，但是直接获得正确的输出会很好:)

原文

I'm currently trying to write a small export function, however I reached a problem when trying to get the correct export format.
The LoadElements functions just generates systematic Lists (of 200 paired elements).

elements = Table[LoadElements[X], {10}];
Export["C:\\Exports\\elements.dat", elements]

Like that i get the desired format and the function is fast: For every List a new Line; Example:
{List1Element1, List1Element2...}
{List2Element1, List2Element2...}
The Problem is: With the Export function I cannot Append new valus to the File.

Than I tried to work with streams: However: 1. It is substantially slower than the Export code, 2. I didn't achieve to get the correct Format:

Do[
file = OpenAppend["C:\\Exports\\elements.dat", PageWidth -> Infinity];
Write[file, elemnts = Table[LoadElements[X], {2}]];
Close[file];
, {2}];

The PageWidth Infinity was needed because otherwise there were Line Breaks, but it gives me the Following Format:
{List1}{List2}
{List3}{List4}
and it is quite slow..

I would be thankfull for an Idea how to be able to easily Append Values to a File with the required Table like format..

thank you a lot, it generally works.

Unfortunately, this produces an additional empty line break between every pair of values, any idea why?
So this produces:
Resultpair

Resultpair
indstead of:
Resultpair
Resultpair
I mean I can manually get rid of the empty line with another script, however it would be nice to directly get the correct output :)

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眼角的笑意。 2025-01-05 21:06:49

您可以考虑结合使用 ExportString （因为 Export 已经生成了您想要的格式）和 WriteString：

elements1 = RandomInteger[99, {15, 2, 5}];

elements2 = RandomInteger[99, {15, 3, 3}];

Export["elements.dat", elements1]

file = OpenAppend["elements.dat"];
WriteString[file, "\n", ExportString[elements2, "Table"]]
Close[file]

You may consider a combination of ExportString (since Export is already producing the format you desire) and WriteString:

elements1 = RandomInteger[99, {15, 2, 5}];

elements2 = RandomInteger[99, {15, 3, 3}];

Export["elements.dat", elements1]

file = OpenAppend["elements.dat"];
WriteString[file, "\n", ExportString[elements2, "Table"]]
Close[file]

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