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Error: objects of unequal length in ... cannot be combined

Sanjay Singha

Posted 3 years ago

What is meant by this message in output? Where is the error exactly? Thread::tdlen: Objects of unequal length in {y1,y2-y1^2 y5,<<5>>,36 y1^5 y3^3-72 y1^5 y2 y3 y4+48 y1^10 y4^2-36 y1^2 y2 y3^2 y5+72 y1^2 y2^2 y4 y5-24 y1^7 y3 y4 y5+30 y1^4 y3^2 y5^2-60 y1^4 y2 y4 y5^2+20 y1^6 y4 y5^3-5 y1^3 y3 y5^4+<<2>>}^{16,1,0,0,0,0,0} cannot be combined.

What is meant by this message in output? Where is the error exactly?

Thread::tdlen: Objects of unequal length in {y1,y2-y1^2 y5,<<5>>,36 y1^5 y3^3-72 y1^5 y2 y3 y4+48 y1^10 y4^2-36 y1^2 y2 y3^2 y5+72 y1^2 y2^2 y4 y5-24 y1^7 y3 y4 y5+30 y1^4 y3^2 y5^2-60 y1^4 y2 y4 y5^2+20 y1^6 y4 y5^3-5 y1^3 y3 y5^4+<<2>>}^{16,1,0,0,0,0,0} cannot be combined.

POSTED BY: Sanjay Singha

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Rohit Namjoshi

Posted 3 years ago

It means exactly what it says. The lists you are passing to `Thread` are not the same length. Thread[f[{1, 2}]] (* {f[1], f[2]} ) Thread[f[{1, 2}, {3, 4}]] ( {f[1, 3], f[2, 4]} ) Thread[f[{1, 2}, 3]] ( {f[1, 3], f[2, 3]} ) Thread[f[{1, 2}, {3}]] ( Thread::tdlen: Objects of unequal length in f[{1,2},{3}] cannot be combined. *)

It means exactly what it says. The lists you are passing to Thread are not the same length.

Thread[f[{1, 2}]]
(* {f[1], f[2]} *)

Thread[f[{1, 2}, {3, 4}]]
(* {f[1, 3], f[2, 4]} *)

Thread[f[{1, 2}, 3]]
(* {f[1, 3], f[2, 3]} *)

Thread[f[{1, 2}, {3}]]
(* Thread::tdlen: Objects of unequal length in f[{1,2},{3}] cannot be combined. *)

POSTED BY: Rohit Namjoshi

EDITORIAL BOARD

EDITORIAL BOARD, WOLFRAM

Posted 3 years ago

Welcome to Wolfram Community! Please make sure you know the rules: https://wolfr.am/READ-1ST Your post is too vague. Please describe your subject extensively providing the code that caused this error message. The rules explain how to format your code properly. If you do not format code, it may become corrupted and useless to other members. Please EDIT your post and make sure code blocks start on a new paragraph and look framed and colored like this. int = Integrate[1/(x^3 - 1), x]; Map[Framed, int, Infinity] You can also embed notebook or attach notebook.

POSTED BY: EDITORIAL BOARD

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