防止“加"从重新安排事物 [英] Preventing "Plus" from rearranging things
问题描述
以下代码创建了一个特定计算的图表.我的问题是,即使分母中的项的顺序很好,但在对其应用 Plus 后,它们会被任意重新排列.任何建议如何强制保留原始订单?
(来源:yaroslavvb.com) ><前>r[i_] := 楼层[(i - 1)/n] + 1;c[i_] := Mod[i, n, 1];adj[a_, b_] := Abs[r[a] - r[b]] + Abs[c[a] - c[b]] == 1;indsetQ[s_] := Not[Or @@ (adj @@@ Subsets[s, {2}])];indsets[k_] := Select[Subsets[Range[n^2], {k}], indsetQ];twoColorGraph[g_, seen_, lbl_] := Module[{radius = .22},vcoords = # -> {c[#], n - r[#]} &/@ Range[n^2];fv = 函数[{p, v}, {EdgeForm[Thick],If[MemberQ[seen, v], Pink, White], Disk[p, radius]}];GraphPlot[g, VertexLabeling -> True, VertexRenderingFunction -> fv,PlotLabel -> Style[lbl, 20], LabelStyle -> Directive[Bold],VertexCoordinateRules -> vcoords, ImageSize -> 80]];n = 2;g = Array[Boole[adj[#1, #2]] &, {n^2, n^2}];weight[set_] := Times @@ (Subscript[\[Lambda], c[#], r[#]] &/@ set);分母 =twoColorGraph[g, #, weight[#]] &/@加入@@ (indsets[#] &/@ Range[2]);numerator = twoColorGraph[g, {1}, weight[{1}]];样式[分子/(加@@分母),字体大小 -> 30]
将诸如 myPlus
之类的内容格式化为 look 之类的技巧,例如 Plus
输出是使用Format
.下面是一个让您入门的简单示例:
格式[myPlus[expr__]] := Row[Riffle[{expr}, "+"]]
然后,您将在笔记本中直观地看到:
In[7]:= x = myPlus[3, 2, 1]出[7]= 3+2+1
...但是 x
仍然会有头部 myPlus
.
这是文档中的教程,其中介绍了有关格式的更多详细信息输出、运算符优先级等
希望有帮助!
The following code creates a diagram of a certain calculation. My problem is that even though the terms in denominator are in a nice order, after applying Plus on it, they get rearranged arbitrarily. Any suggestions how to force the original order to be kept?
(source: yaroslavvb.com)
r[i_] := Floor[(i - 1)/n] + 1; c[i_] := Mod[i, n, 1]; adj[a_, b_] := Abs[r[a] - r[b]] + Abs[c[a] - c[b]] == 1; indsetQ[s_] := Not[Or @@ (adj @@@ Subsets[s, {2}])]; indsets[k_] := Select[Subsets[Range[n^2], {k}], indsetQ]; twoColorGraph[g_, seen_, lbl_] := Module[{radius = .22}, vcoords = # -> {c[#], n - r[#]} & /@ Range[n^2]; fv = Function[{p, v}, {EdgeForm[Thick], If[MemberQ[seen, v], Pink, White], Disk[p, radius]}]; GraphPlot[g, VertexLabeling -> True, VertexRenderingFunction -> fv, PlotLabel -> Style[lbl, 20], LabelStyle -> Directive[Bold], VertexCoordinateRules -> vcoords, ImageSize -> 80] ]; n = 2; g = Array[Boole[adj[#1, #2]] &, {n^2, n^2}]; weight[set_] := Times @@ (Subscript[\[Lambda], c[#], r[#]] & /@ set); denominator = twoColorGraph[g, #, weight[#]] & /@ Join @@ (indsets[#] & /@ Range[2]); numerator = twoColorGraph[g, {1}, weight[{1}]]; Style[numerator/(Plus @@ denominator), FontSize -> 30]
The trick to formatting something like myPlus
to look like Plus
on output is to use Format
. Here's a simple example to get you started:
Format[myPlus[expr__]] := Row[Riffle[{expr}, "+"]]
Then, what you will see visually in the notebook is:
In[7]:= x = myPlus[3, 2, 1]
Out[7]= 3+2+1
... but x
will still have head myPlus
.
Here is a tutorial from the documentation that goes into more details about formatting output, operator precedence, etc.
Hope that helps!
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