Replace array elements with another small array using indexing

2020 5 19
1 个回答
更新时间：2020 5 19
3 次查看（30 天）

0 个投票

Hi everyone,how to replace array with another small array using indexing
a=[1 1 4 1 3 3 1 1 1 3 4 1 0 0 0 0 0 0 0 0 0];
%replace 1 4 1 with 0 3 0 and 3 4 1 with 2 and b=b(b~=0); to get a new vector
b=[1 3 3 3 1 1 1 2];
Thank you.

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Matt J
Matt J 2020-5-19
%replace 1 4 1 with 0 3 0
The output you've shown has 1 4 1 replaced with 3, not with 0 3 0.
TEJAS PHUTANE
TEJAS PHUTANE 2020-5-19
I want to do it both ways, replace with 3 or with 0 3 0 and use b=b(b~=0); to get a new array without 0.
TEJAS PHUTANE
TEJAS PHUTANE 2020-5-19
%my code:
path=[1 1 4 1 3 3 1 1 1 3 4 1 0 0 0 0 0 0 0 0];
p=path;
n=length(p);
for i=1;i=n-3;i=i+1;
if ( p(i)==1 && p(i+1)==4 && p(i+2)==1)
p(i:i+2)= [0 3 0];
end
end
p=p(p~=0);
still not getting desired output

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回答（1 个）

Matt J
Matt J 2020-5-19

0 个投票

b=strrep( strrep(a,[1 4 1],3) ,[3 4 1],2)

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TEJAS PHUTANE
TEJAS PHUTANE 2020-5-19
this actually works but a warning occurs:Inputs must be character vectors, cell arrays of character vectors, or string arrays.
TEJAS PHUTANE
TEJAS PHUTANE 2020-5-19
if instead of integers i have character vector like
path=["L" "L" "U" "L" "S" "S" "L" "L" "L" "S" "U" "L" "0" "0" "0" "0" "0" "0" "0" "0"];
how can i get shortest path (for line maze) eg: replace L U L with S and S U L with R.
shortpath=["L" "S" "S" "S" "L" "L" "L" "R"];

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