本文介绍了从Mathematica中导出自定义格式化的表达式的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧! 问题描述 限时删除!! 我怎样才能让Mathematica输出/保存/写入一个适当的Fortan77格式的文本文件,即第二列的72列和一个连续的标记? 我正在使用Mathematica来生成大而复杂的分析表达式,然后我需要将其插入到预先存在的Fortran77代码中。在Mathematica的前端,所有的东西都可以正常工作,它们是 FortranForm [] 和 SetOptions [$ Output,PageWidth - >不过,我不知道如何让Mathematica正确地输出到文本文件。我想要的是这样的: $ b $ pre $ code MM11 = mH1 ** 2 +(g2 ** 2 * v1 ** 2)/ 2 。 - - (g2 ** 2 *(v1 ** 2/2。 - - ((v2 * Cos(phi2) - (0,1)* v2 * Sin(phi2))* $ (v2 * Cos(phi2)+(0,1)* v2 * Sin(ph2)))/ 2。))/ 2。 ... 但是得到这个: MM11 = FortranForm [mH1 ^ 2 +(g2 ^ 2 * v1 ^ 2)/ 2 - ... 或者这个: $ p $ MM11 = mH1 ** 2 +(g2 ** 2 * v1 ** 2)/ 2。 - (g2 ** 2 * (v1 ** 2/2。 - ((v2 * Cos(phi2) - (0,1)* v2 * Sin(phi2))* ... 解决方案这是一个令人吃惊的鲜为人知的 Splice 函数首先,创建一个扩展名为。mf的模板文件,如下所示: file =test.mf; out = OpenWrite [file]; WriteString [out,MH1 =< * form *>]; 关闭[out]; 现在当您使用 Splice 时,Mathematica会自动替换< 和 *>> 分隔符与它的求值形式所以如果你设置 form = 4 + b9 ^ 2 + c1 ^ 5 + c4 ^ 5 + h10 ^ 4 + j2 + k10 ^ 4 + p10 ^ 4 + q5 ^ 5 + q8 + s3 ^ 3 + s7 ^ 2 + t6 ^ 3 + u3 ^ 2 + u9 ^ 3 + x8 ^ 4 + z2 ^ 3; 和 Splice [test.mf,PageWidth - > 72]; 哪会自动推断你想要 FortranForm 从文件扩展名输出,并允许您设置 PageWidth 作为选项,您将在自动生成的文件test.f(注意新的扩展名)中获得相当不错的结果: - q5 ** 5 + q8 + s3 ** 3 + s7 ** 2 + t6 ** 3 + u3 ** 2 + u9 ** 3 + x8 ** 4 + - z2 ** 3 查看 Splice 以获取更多选项(更改输出文件的名称等)。 How can I get Mathematica to export/save/write a text file with proper Fortan77 formatting, that is, 72 columns and a continuation marker on the sixth column?I am using Mathematica to generate large and complex analytic expressions, which I then need to insert into pre-existing Fortran77 code. I have everything working correctly in the front end of Mathematica with FortranForm[] andSetOptions[$Output, PageWidth -> 72]However, I can't figure out how to get Mathematica to output correctly to a text file. I want something like this:MM11 = mH1**2 + (g2**2*v1**2)/2. - - (g2**2*(v1**2/2. - - ((v2*Cos(phi2) - (0,1)*v2*Sin(phi2))* - (v2*Cos(phi2) + (0,1)*v2*Sin(phi2)))/2.))/2....but get either this:MM11 = FortranForm[mH1^2 + (g2^2*v1^2)/2 - ...or this:MM11 = mH1**2 + (g2**2*v1**2)/2. - (g2**2* (v1**2/2. - ((v2*Cos(phi2) - (0,1)*v2*Sin(phi2))*... 解决方案 This is a job for the surprisingly little-known Splice function. First, you make a template file, with the extension ".mf", like so:file = "test.mf";out = OpenWrite[file];WriteString[out, "MH1 = <* form *>"];Close[out];Now when you use Splice, Mathematica will automatically replace everything between the <* and *> delimiters with its evaluated form. So if you set form = 4 + b9^2 + c1^5 + c4^5 + h10^4 + j2 + k10^4 + p10^4 + q5^5 + q8 + s3^3 + s7^2 + t6^3 + u3^2 + u9^3 + x8^4 + z2^3;and callSplice["test.mf", PageWidth -> 72];which will automatically infer you want FortranForm output from the file extension, and which allows you to set PageWidth as an option, you will get a pretty decent result in the automatically generated file "test.f" (note the new extension):MH1 = 4 + b9**2 + c1**5 + c4**5 + h10**4 + j2 + k10**4 + p10**4 + - q5**5 + q8 + s3**3 + s7**2 + t6**3 + u3**2 + u9**3 + x8**4 + - z2**3Look at the docs for Splice for more options (changing the name of the output file and the like). 这篇关于从Mathematica中导出自定义格式化的表达式的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持! 1403页,肝出来的.. 09-06 11:17