### MATLAB >> How to rearrange a matrix upsidedown?

by **khaluaa7** » Sat, 07 Feb 2004 07:44:44 GMT

Hello everyone,

I have a matrix made of 100 rows and 200 columns.

I want to reformat the matrix so that:

1-The 1st row which is on top of the matrix becomes the last row of

the matrix

2-The 100th row which is at the bottom of the matrix becomes the 1st

row of the matrix

In the sense that:

Old Matrix New Matrix

row 1 row 100

row 2 row 99

row 3 row 98

row ... ...

row 50 row 50

row ... ...

row 98 row 3

row 99 row 2

row 100 row 1

Could someone help me?

Thank you

Nuage

### MATLAB >> How to rearrange a matrix upsidedown?

by **ross woods** » Sat, 07 Feb 2004 07:57:50 GMT

help flipud

ross

### MATLAB >> How to rearrange a matrix upsidedown?

by **khaluaa7** » Sat, 07 Feb 2004 11:57:54 GMT

Hi Ross

Thank you very much for your help ;-).

Nuage

### MATLAB >> How to rearrange a matrix upsidedown?

by **Jos** » Mon, 09 Feb 2004 18:51:13 GMT

XXXX@XXXXX.COM (Nuage) wrote in

You can use vector-indexing

new = old(end:-1:1,:) ;

or take a look at the (slower) FLIPUD function.

Jos

--

Email: jnvdg AT arcor DOT de

### MATLAB >> How to rearrange a matrix upsidedown?

by **khaluaa7** » Tue, 10 Feb 2004 12:09:48 GMT

Hello Jos

How are you?

Thank you for your help.

What does the command means?

new file equal old final, start at the end(last row) and end at row 1,

with increment of minus 1 for all columns of that row at the same time

...?

Thank you

Nuage

### MATLAB >> How to rearrange a matrix upsidedown?

by **Jos** » Tue, 10 Feb 2004 16:44:59 GMT

XXXX@XXXXX.COM (Nuage) wrote in

Hi Nuage,

you are right. I think it will help you a great deal to read some stuff on

matrix indexing in matlab (see for instance the help files).

Jos

--

Email: jnvdg AT arcor DOT de

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