How to get coordinates of largest element in an array?

Question

Prerna Mishra 2022년 7월 21일

0
링크

이 질문에 대한 바로 가기 링크

https://kr.mathworks.com/matlabcentral/answers/1764780-how-to-get-coordinates-of-largest-element-in-an-array

답변: Stephen23 2022년 7월 21일

I have an array RHSvec that looks as follows:

RHSvec = [-2.37702213697260e+17	-2.33711662054550e+19	-615937600693473	-4.41919914907522e+19	-3.50291921355524e+20;
-2.40560608664763e+29	-2.16934082274551e+19	-5.73988280489045e+15	-5.33311081810851e+17	-1.17461587901498e+20;
-2.32915727020229e+17	-2.45850745864384e+19	-616589732914132	-6.16155763686288e+15	-4.91512660764408e+19;
-2.32993977385979e+17	-2.14986528565165e+19	-2.94155364006571e+15	-3.65210939697662e+15	-2.12320586283470e+23;
-2.41504694091774e+17	-2.14752641506426e+19	-625473159572963	-3.67525135357355e+17	-4.90376317631114e+19;
-2.33465933952372e+17	-2.15460612285011e+19	-9.81511044091666e+20	-4.19405807636241e+15	-4.90257920973114e+19;
-2.34071058671374e+17	-2.15547532573166e+19	-1.43052472228394e+15	-8.62043004357417e+15	-4.90258050787429e+19]

When I do the following:

[RHSval,kprimeind] = max(RHSvec)

I get

RHSval =
1.0e+19 *
-0.0233   -2.1475   -0.0001   -0.0004   -4.9026

And

kprimeind =
3     5     1     4     6

What I want is

kprimeind = 
3 5 1 4 6

And

dprimeind = 
1 2 3 4 5

Basically I want coordinates (3,1) (5,2), (1,3), (4,4) (6,1)

How do it get this?

댓글 수: 0
이전 댓글 -2개 표시이전 댓글 -2개 숨기기

댓글을 달려면 로그인하십시오.

이 질문에 답변하려면 로그인하십시오.

Answer 1

KSSV 2022년 7월 21일

0
링크

이 답변에 대한 바로 가기 링크

https://kr.mathworks.com/matlabcentral/answers/1764780-how-to-get-coordinates-of-largest-element-in-an-array#answer_1012145

MATLAB Online에서 열기

[val,idx] = max(RHSvec) ;
[i,j] = ind2sub(size(RHSvec),idx') ;
[i j]

댓글 수: 2
없음 표시없음 숨기기

Prerna Mishra 2022년 7월 21일

With this is get 3 5 1 4 6 and 1 1 1 1 1, not 1 2 3 4 5.

KSSV 2022년 7월 21일

MATLAB Online에서 열기

May be you are looking for max along columns...

TRy:

[val,idx] = max(RHSvec,[],2) ;

댓글을 달려면 로그인하십시오.

Answer 2

Stephen23 2022년 7월 21일

0
링크

이 답변에 대한 바로 가기 링크

https://kr.mathworks.com/matlabcentral/answers/1764780-how-to-get-coordinates-of-largest-element-in-an-array#answer_1012180

MATLAB Online에서 열기

format long G
M = [-2.37702213697260e+17,-2.33711662054550e+19,-615937600693473,-4.41919914907522e+19,-3.50291921355524e+20;-2.40560608664763e+29,-2.16934082274551e+19,-5.73988280489045e+15,-5.33311081810851e+17,-1.17461587901498e+20;-2.32915727020229e+17,-2.45850745864384e+19,-616589732914132,-6.16155763686288e+15,-4.91512660764408e+19;-2.32993977385979e+17,-2.14986528565165e+19,-2.94155364006571e+15,-3.65210939697662e+15,-2.12320586283470e+23;-2.41504694091774e+17,-2.14752641506426e+19,-625473159572963,-3.67525135357355e+17,-4.90376317631114e+19;-2.33465933952372e+17,-2.15460612285011e+19,-9.81511044091666e+20,-4.19405807636241e+15,-4.90257920973114e+19;-2.34071058671374e+17,-2.15547532573166e+19,-1.43052472228394e+15,-8.62043004357417e+15,-4.90258050787429e+19]
M = 7×5
1.0e+00 *

      -2.3770221369726e+17      -2.3371166205455e+19          -615937600693473     -4.41919914907522e+19     -3.50291921355524e+20
     -2.40560608664763e+29     -2.16934082274551e+19     -5.73988280489045e+15     -5.33311081810851e+17     -1.17461587901498e+20
     -2.32915727020229e+17     -2.45850745864384e+19          -616589732914132     -6.16155763686288e+15     -4.91512660764408e+19
     -2.32993977385979e+17     -2.14986528565165e+19     -2.94155364006571e+15     -3.65210939697662e+15      -2.1232058628347e+23
     -2.41504694091774e+17     -2.14752641506426e+19          -625473159572963     -3.67525135357355e+17     -4.90376317631114e+19
     -2.33465933952372e+17     -2.15460612285011e+19     -9.81511044091666e+20     -4.19405807636241e+15     -4.90257920973114e+19
     -2.34071058671374e+17     -2.15547532573166e+19     -1.43052472228394e+15     -8.62043004357417e+15     -4.90258050787429e+19
[V,X] = max(M,[],1,'linear');
[R,C] = ind2sub(size(M),X)
R = 1×5
     3     5     1     4     6
C = 1×5
     1     2     3     4     5