Problems with rounding giving too many digits












3












$begingroup$


My current code is:



round = .1;

f[x_] := x + 4 - Sqrt[3 x^2 - 5]

xx = Solve[f[x] == 0, Reals];

StringForm["x=`1`", 

If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round], 

"none"]]



x=5.800000000000001`




which i want to give me an output of "x = 5.8" instead.



Any advice would be appreciated.






formatting round







share|improve this question











$endgroup$












  • $begingroup$
    StringForm["x=1", If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round // Rationalize] // N, "none"]]
    $endgroup$
    – Bob Hanlon
    yesterday






  • 1




    $begingroup$
    Could round exactly and then use N: N[Round[Max[xx[[All, 1, 2]]], 1/10]]
    $endgroup$
    – Daniel Lichtblau
    yesterday
















3












$begingroup$


My current code is:



round = .1;

f[x_] := x + 4 - Sqrt[3 x^2 - 5]

xx = Solve[f[x] == 0, Reals];

StringForm["x=`1`", 

If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round], 

"none"]]



x=5.800000000000001`




which i want to give me an output of "x = 5.8" instead.



Any advice would be appreciated.






formatting round







share|improve this question











$endgroup$












  • $begingroup$
    StringForm["x=1", If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round // Rationalize] // N, "none"]]
    $endgroup$
    – Bob Hanlon
    yesterday






  • 1




    $begingroup$
    Could round exactly and then use N: N[Round[Max[xx[[All, 1, 2]]], 1/10]]
    $endgroup$
    – Daniel Lichtblau
    yesterday














3












3








3





$begingroup$


My current code is:



round = .1;

f[x_] := x + 4 - Sqrt[3 x^2 - 5]

xx = Solve[f[x] == 0, Reals];

StringForm["x=`1`", 

If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round], 

"none"]]



x=5.800000000000001`




which i want to give me an output of "x = 5.8" instead.



Any advice would be appreciated.






formatting round







share|improve this question











$endgroup$




My current code is:



round = .1;

f[x_] := x + 4 - Sqrt[3 x^2 - 5]

xx = Solve[f[x] == 0, Reals];

StringForm["x=`1`", 

If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round], 

"none"]]



x=5.800000000000001`




which i want to give me an output of "x = 5.8" instead.



Any advice would be appreciated.






formatting round




formatting round






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited yesterday









Alexey Popkov

38.5k4108263




38.5k4108263










asked yesterday









WomblesWombles

684




684












  • $begingroup$
    StringForm["x=1", If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round // Rationalize] // N, "none"]]
    $endgroup$
    – Bob Hanlon
    yesterday






  • 1




    $begingroup$
    Could round exactly and then use N: N[Round[Max[xx[[All, 1, 2]]], 1/10]]
    $endgroup$
    – Daniel Lichtblau
    yesterday


















  • $begingroup$
    StringForm["x=1", If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round // Rationalize] // N, "none"]]
    $endgroup$
    – Bob Hanlon
    yesterday






  • 1




    $begingroup$
    Could round exactly and then use N: N[Round[Max[xx[[All, 1, 2]]], 1/10]]
    $endgroup$
    – Daniel Lichtblau
    yesterday
















$begingroup$
StringForm["x=1", If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round // Rationalize] // N, "none"]]
$endgroup$
– Bob Hanlon
yesterday




$begingroup$
StringForm["x=1", If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round // Rationalize] // N, "none"]]
$endgroup$
– Bob Hanlon
yesterday




1




1




$begingroup$
Could round exactly and then use N: N[Round[Max[xx[[All, 1, 2]]], 1/10]]
$endgroup$
– Daniel Lichtblau
yesterday




$begingroup$
Could round exactly and then use N: N[Round[Max[xx[[All, 1, 2]]], 1/10]]
$endgroup$
– Daniel Lichtblau
yesterday










3 Answers
3






active

oldest

votes


















5












$begingroup$

You could add a StandardForm wrapper:



StringForm["x=`1`",StandardForm @ If[Length[xx]>=1,Round[Max[xx[[All,1,2]]],round],"none"]]



x=5.8







share|improve this answer









$endgroup$













  • $begingroup$
    Thank you! that worked and i have no idea why, i'll read the documentation for standardForm
    $endgroup$
    – Wombles
    yesterday



















4












$begingroup$

StringForm["x=`1`", If[Length[xx] >= 1, 

  DecimalForm[Round[Max[xx[[All, 1, 2]]], round], DefaultPrintPrecision -> 2], 

  "none"]]



x = 5.8




Same result with NumberForm in place of DecimalForm.






share|improve this answer











$endgroup$













  • $begingroup$
    Thank you, this worked great
    $endgroup$
    – Wombles
    yesterday



















2












$begingroup$

StringJoin["x=",If[Length[xx] >= 1, ToString[Round[Max[xx[[All, 1, 2]]]*10]/10.]]]



x = 5.8




Round[q*10] rounds 10q to the nearest integeger.



Round[q*10]/10 rounds q to the nearest tenth.



ToString turns an expression into a string and StringJoin joins strings, both aptly named ...






share|improve this answer











$endgroup$













  • $begingroup$
    Just fixed a typo (was missing a right bracket (])).
    $endgroup$
    – mjw
    21 hours ago













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3 Answers
3






active

oldest

votes








3 Answers
3






active

oldest

votes









active

oldest

votes






active

oldest

votes









5












$begingroup$

You could add a StandardForm wrapper:



StringForm["x=`1`",StandardForm @ If[Length[xx]>=1,Round[Max[xx[[All,1,2]]],round],"none"]]



x=5.8







share|improve this answer









$endgroup$













  • $begingroup$
    Thank you! that worked and i have no idea why, i'll read the documentation for standardForm
    $endgroup$
    – Wombles
    yesterday
















5












$begingroup$

You could add a StandardForm wrapper:



StringForm["x=`1`",StandardForm @ If[Length[xx]>=1,Round[Max[xx[[All,1,2]]],round],"none"]]



x=5.8







share|improve this answer









$endgroup$













  • $begingroup$
    Thank you! that worked and i have no idea why, i'll read the documentation for standardForm
    $endgroup$
    – Wombles
    yesterday














5












5








5





$begingroup$

You could add a StandardForm wrapper:



StringForm["x=`1`",StandardForm @ If[Length[xx]>=1,Round[Max[xx[[All,1,2]]],round],"none"]]



x=5.8







share|improve this answer









$endgroup$



You could add a StandardForm wrapper:



StringForm["x=`1`",StandardForm @ If[Length[xx]>=1,Round[Max[xx[[All,1,2]]],round],"none"]]



x=5.8








share|improve this answer












share|improve this answer



share|improve this answer










answered yesterday









Carl WollCarl Woll

69.6k394180




69.6k394180












  • $begingroup$
    Thank you! that worked and i have no idea why, i'll read the documentation for standardForm
    $endgroup$
    – Wombles
    yesterday


















  • $begingroup$
    Thank you! that worked and i have no idea why, i'll read the documentation for standardForm
    $endgroup$
    – Wombles
    yesterday
















$begingroup$
Thank you! that worked and i have no idea why, i'll read the documentation for standardForm
$endgroup$
– Wombles
yesterday




$begingroup$
Thank you! that worked and i have no idea why, i'll read the documentation for standardForm
$endgroup$
– Wombles
yesterday











4












$begingroup$

StringForm["x=`1`", If[Length[xx] >= 1, 

  DecimalForm[Round[Max[xx[[All, 1, 2]]], round], DefaultPrintPrecision -> 2], 

  "none"]]



x = 5.8




Same result with NumberForm in place of DecimalForm.






share|improve this answer











$endgroup$













  • $begingroup$
    Thank you, this worked great
    $endgroup$
    – Wombles
    yesterday
















4












$begingroup$

StringForm["x=`1`", If[Length[xx] >= 1, 

  DecimalForm[Round[Max[xx[[All, 1, 2]]], round], DefaultPrintPrecision -> 2], 

  "none"]]



x = 5.8




Same result with NumberForm in place of DecimalForm.






share|improve this answer











$endgroup$













  • $begingroup$
    Thank you, this worked great
    $endgroup$
    – Wombles
    yesterday














4












4








4





$begingroup$

StringForm["x=`1`", If[Length[xx] >= 1, 

  DecimalForm[Round[Max[xx[[All, 1, 2]]], round], DefaultPrintPrecision -> 2], 

  "none"]]



x = 5.8




Same result with NumberForm in place of DecimalForm.






share|improve this answer











$endgroup$



StringForm["x=`1`", If[Length[xx] >= 1, 

  DecimalForm[Round[Max[xx[[All, 1, 2]]], round], DefaultPrintPrecision -> 2], 

  "none"]]



x = 5.8




Same result with NumberForm in place of DecimalForm.







share|improve this answer














share|improve this answer



share|improve this answer








edited yesterday

























answered yesterday









kglrkglr

187k10203421




187k10203421












  • $begingroup$
    Thank you, this worked great
    $endgroup$
    – Wombles
    yesterday


















  • $begingroup$
    Thank you, this worked great
    $endgroup$
    – Wombles
    yesterday
















$begingroup$
Thank you, this worked great
$endgroup$
– Wombles
yesterday




$begingroup$
Thank you, this worked great
$endgroup$
– Wombles
yesterday











2












$begingroup$

StringJoin["x=",If[Length[xx] >= 1, ToString[Round[Max[xx[[All, 1, 2]]]*10]/10.]]]



x = 5.8




Round[q*10] rounds 10q to the nearest integeger.



Round[q*10]/10 rounds q to the nearest tenth.



ToString turns an expression into a string and StringJoin joins strings, both aptly named ...






share|improve this answer











$endgroup$













  • $begingroup$
    Just fixed a typo (was missing a right bracket (])).
    $endgroup$
    – mjw
    21 hours ago


















2












$begingroup$

StringJoin["x=",If[Length[xx] >= 1, ToString[Round[Max[xx[[All, 1, 2]]]*10]/10.]]]



x = 5.8




Round[q*10] rounds 10q to the nearest integeger.



Round[q*10]/10 rounds q to the nearest tenth.



ToString turns an expression into a string and StringJoin joins strings, both aptly named ...






share|improve this answer











$endgroup$













  • $begingroup$
    Just fixed a typo (was missing a right bracket (])).
    $endgroup$
    – mjw
    21 hours ago
















2












2








2





$begingroup$

StringJoin["x=",If[Length[xx] >= 1, ToString[Round[Max[xx[[All, 1, 2]]]*10]/10.]]]



x = 5.8




Round[q*10] rounds 10q to the nearest integeger.



Round[q*10]/10 rounds q to the nearest tenth.



ToString turns an expression into a string and StringJoin joins strings, both aptly named ...






share|improve this answer











$endgroup$



StringJoin["x=",If[Length[xx] >= 1, ToString[Round[Max[xx[[All, 1, 2]]]*10]/10.]]]



x = 5.8




Round[q*10] rounds 10q to the nearest integeger.



Round[q*10]/10 rounds q to the nearest tenth.



ToString turns an expression into a string and StringJoin joins strings, both aptly named ...







share|improve this answer














share|improve this answer



share|improve this answer








edited 20 hours ago

























answered yesterday









mjwmjw

5429




5429












  • $begingroup$
    Just fixed a typo (was missing a right bracket (])).
    $endgroup$
    – mjw
    21 hours ago




















  • $begingroup$
    Just fixed a typo (was missing a right bracket (])).
    $endgroup$
    – mjw
    21 hours ago


















$begingroup$
Just fixed a typo (was missing a right bracket (])).
$endgroup$
– mjw
21 hours ago






$begingroup$
Just fixed a typo (was missing a right bracket (])).
$endgroup$
– mjw
21 hours ago




















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