# Why did Riffle mess up? [closed]

I have a list x95 (notice how the increment changes from 0.05 to 0.005 towards the end):

{{0}, {0.05}, {0.1}, {0.15}, {0.2}, {0.25}, {0.3}, {0.35},
{0.4}, {0.45}, {0.5}, {0.55}, {0.6}, {0.65}, {0.7}, {0.75},
{0.8}, {0.85}, {0.9}, {0.95}, {1}, {1.05}, {1.1}, {1.15},
{1.2}, {1.25}, {1.3}, {1.35}, {1.4}, {1.45}, {1.5}, {1.55},
{1.6}, {1.65}, {1.7}, {1.75}, {1.8}, {1.85}, {1.9}, {1.95},
{2}, {2.05}, {2.1}, {2.15}, {2.2}, {2.25}, {2.3}, {2.35},
{2.4}, {2.45}, {2.5}, {2.55}, {2.6}, {2.65}, {2.7}, {2.75},
{2.8}, {2.85}, {2.9}, {2.95}, {3}, {3.05}, {3.1}, {3.15},
{3.2}, {3.25}, {3.3}, {3.35}, {3.4}, {3.45}, {3.5}, {3.55},
{3.6}, {3.65}, {3.7}, {3.70497474}, {3.70997474}, {3.71497474},
{3.71997474}, {3.72497474}, {3.72997474}, {3.73497474}, {3.73997474},
{3.74497474}, {3.74997474}, {3.75497474}, {3.75997474},
{3.76497474}, {3.76997474}, {3.77497474}, {3.77997474},
{3.78497474}, {3.78997474}}


And a list f95 (new paragraph corresponds to the increments switch of x95):

{{-0.011658568}, {-0.0096303775}, {-0.0076848125},
{-0.0057832125}, {-0.00392636}, {-0.0021098835}, {-0.000339062},
{0.0013843615}, {0.003072948}, {0.0047233835}, {0.006339129},
{0.007899272}, {0.0094290445}, {0.0109139055}, {0.0123779205},
{0.0137939155}, {0.0151725645}, {0.016522783}, {0.0178391455},
{0.0191238585}, {0.0203645985}, {0.021585122}, {0.0227680155},
{0.0239206115}, {0.0250345905}, {0.0261265775}, {0.027196839},
{0.028219475}, {0.0292256795}, {0.0302053775}, {0.031153609},
{0.032070067}, {0.0329778765}, {0.033838429}, {0.034681311},
{0.035495814}, {0.036306521}, {0.037065547}, {0.0378140655},
{0.0385447895}, {0.039250012}, {0.0399386065}, {0.040598848},
{0.0412283045}, {0.0418467445}, {0.0424523565}, {0.0430087655},
{0.0435565075}, {0.0441070605}, {0.044619163}, {0.0451372175},
{0.0456159075}, {0.046084604}, {0.046534717}, {0.046982633},
{0.0474072485}, {0.0478109985}, {0.0482038205}, {0.0485703495},
{0.0489372695}, {0.049276349}, {0.0496135135}, {0.0499217255},
{0.0502257995}, {0.0505225905}, {0.0507854845}, {0.0510497065},
{0.0513002635}, {0.0515403305}, {0.0517684665}, {0.0519712595},
{0.052158684}, {0.052357398}, {0.0525214875}, {0.052670356},

{0.0526849085}, {0.05269907}, {0.052704355}, {0.0527211285},
{0.052730587}, {0.052742517}, {0.052750964}, {0.0527590795},
{0.0527687525}, {0.0527770315}, {0.052783427}, {0.052786248},
{0.0527845865}, {0.0527776325}, {0.0527652825}, {0.05274558},
{0.0527230645}, {0.006090035}}


Both lists are 93 elements long. These are the x and y coordinates that I want to put in a ListPlot. I used the command

xy95 = Partition[Flatten[Riffle[x95, f95], 1], 2]


but got this (I made a new paragraph where Riffle "messes up"):

{{0, -0.011658568}, {0.05, -0.0096303775}, {0.1, -0.0076848125},
{0.15, -0.0057832125}, {0.2, -0.00392636}, {0.25, -0.0021098835},
{0.3, -0.000339062}, {0.35, 0.0013843615}, {0.4, 0.003072948},
{0.45, 0.0047233835}, {0.5, 0.006339129}, {0.55, 0.007899272},
{0.6, 0.0094290445}, {0.65, 0.0109139055}, {0.7, 0.0123779205},
{0.75, 0.0137939155}, {0.8, 0.0151725645}, {0.85, 0.016522783},
{0.9, 0.0178391455}, {0.95, 0.0191238585}, {1, 0.0203645985},
{1.05, 0.021585122}, {1.1, 0.0227680155}, {1.15, 0.0239206115},
{1.2, 0.0250345905}, {1.25, 0.0261265775}, {1.3, 0.027196839},
{1.35, 0.028219475}, {1.4, 0.0292256795}, {1.45, 0.0302053775},
{1.5, 0.031153609}, {1.55, 0.032070067}, {1.6, 0.0329778765},
{1.65, 0.033838429}, {1.7, 0.034681311}, {1.75, 0.035495814},
{1.8, 0.036306521}, {1.85, 0.037065547}, {1.9, 0.0378140655},
{1.95, 0.0385447895}, {2, 0.039250012}, {2.05, 0.0399386065},
{2.1, 0.040598848}, {2.15, 0.0412283045}, {2.2, 0.0418467445},
{2.25, 0.0424523565}, {2.3, 0.0430087655}, {2.35, 0.0435565075},
{2.4, 0.0441070605}, {2.45, 0.044619163}, {2.5, 0.0451372175},
{2.55, 0.0456159075}, {2.6, 0.046084604}, {2.65, 0.046534717},
{2.7, 0.046982633}, {2.75, 0.0474072485}, {2.8, 0.0478109985},
{2.85, 0.0482038205}, {2.9, 0.0485703495}, {2.95, 0.0489372695},
{3, 0.049276349}, {3.05, 0.0496135135}, {3.1, 0.0499217255},
{3.15, 0.0502257995}, {3.2, 0.0505225905}, {3.25, 0.0507854845},
{3.3, 0.0510497065}, {3.35, 0.0513002635}, {3.4, 0.0515403305},
{3.45, 0.0517684665}, {3.5, 0.0519712595}, {3.55, 0.052158684},
{3.6, 0.052357398}, {3.65, 0.0525214875}, {3.7, 0.052670356},

{3.70497474, 0.0527773175}, {3.70997474, 0.0060403695},
{3.71497474, -0.011658568}, {3.71997474, -0.0096303775},
{3.72497474, -0.0076848125}, {3.72997474, -0.0057832125},
{3.73497474, -0.00392636}, {3.73997474, -0.0021098835},
{3.74497474, -0.000339062}, {3.74997474, 0.0013843615},
{3.75497474, 0.003072948}, {3.75997474, 0.0047233835},
{3.76497474, 0.006339129}, {3.76997474, 0.007899272},
{3.77497474, 0.0094290445}, {3.77997474, 0.0109139055},
{3.78497474, 0.0123779205}}


As you can see, it kept riffling the x95 elements correctly up until the x increment changed, and then f95 kind of broke down and it invented random new elements. The "second paragraph" of f95 does not match the y coordinate for the second paragraph of xy95. I have no idea why it stopped working correctly though I realize it probably has something to do with the upset pattern in x95.

## closed as off-topic by MarcoB, m_goldberg, ciao, Mr.Wizard♦Aug 1 '17 at 9:42

This question appears to be off-topic. The users who voted to close gave these specific reasons:

• "This question cannot be answered without additional information. Questions on problems in code must describe the specific problem and include valid code to reproduce it. Any data used for programming examples should be embedded in the question or code to generate the (fake) data must be included." – MarcoB, Mr.Wizard
• "This question arises due to a simple mistake such as a trivial syntax error, incorrect capitalization, spelling mistake, or other typographical error and is unlikely to help any future visitors, or else it is easily found in the documentation." – m_goldberg, ciao
If this question can be reworded to fit the rules in the help center, please edit the question.

• Don't you just want: Transpose@(Flatten /@ {x95, f95})? I otherwise cannot reproduce what you saw. – MarcoB Jul 31 '17 at 21:57

I think you merely want a Join:

new = Join[x95, f95, 2];

Short[new]

{{0, -0.0116586}, {0.05, -0.00963038}, <<89>>, {3.78497, 0.0527231}, {3.78997,
0.00609004}}

ListLinePlot[new]


• That is indeed what I expect the plot to look like. For me this input produced the same output that I saw in the original question. You guys don't seem to have trouble so maybe my version of mathematica is the issue or maybe my computer is just screwy – Eric Jul 31 '17 at 23:08
• wait I lied, now I get this: {{0, -0.0116586}, {0.05, -0.00963038}, {0.1, -0.00768481}, {0.15, \ -0.00578321}, {0.2, -0.00392636},<<83>>, {3.76997}, {3.77497}, {3.77997}, {3.78497}, {3.78997}} which is even further from correct. – Eric Jul 31 '17 at 23:13
• @Eric More likely your input is not correct. Try copying the data out of your Question itself, since that seems to have worked for me. – Mr.Wizard Jul 31 '17 at 23:15
• Well the data in the question is copied from the data that I've been using... – Eric Jul 31 '17 at 23:22
• I'm both happy and really annoyed to report that it turned out to be an issue of turn it off and back on again. Thanks for your suggestions – Eric Jul 31 '17 at 23:46
ListLinePlot@Transpose[Flatten /@ {x95, f95}]


or

ListLinePlot@Partition[Flatten@Riffle[x95, f95], 2]


both give the desired result