The Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Math Forum » Discussions » Software » comp.soft-sys.matlab

Topic: help : how to reverse 2-D lookup table ?
Replies: 10   Last Post: Oct 30, 2013 5:54 AM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
meng yan

Posts: 5
Registered: 1/29/10
Re: help : how to reverse 2-D lookup table ?
Posted: Jan 30, 2010 6:04 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

ImageAnalyst <> wrote in message <>...
> I don't understand this: a(a=a(T,b))
> I don't know what you're trying to get.
> Are you trying to get a profile or contours or something like that?
> For example, let's say that T is a 2D array and for a certain row and
> column, T will have a value. Do you then want to find all rows and
> column where T = 42 (for example, or some other value)? Something
> like this code from the help?
> [X,Y,Z] = peaks(30);
> surfc(X,Y,Z)
> colormap hsv
> axis([-3 3 -3 3 -10 5])
> set(gcf, 'Position', get(0,'Screensize')); % Maximize figure.
> Of maybe you can simply use the find() function, like
> [rows columns] = find(T == 42)
> Giving us a better description of what you want will get you better
> answers.

Hi,ImageAnalyst,I'm sorry to failed to description it clearly.
the question is : I have a matrix T , two vectors a and b,size(T)=101*181,
size(a)=1*101,size(b)=181*1,so I can use 2-D lookup table blocks to got the value of T depending on the input a and b, the most important question is I don't know the relation between T with a and b,only their datas .so if I want to got the value of a , the input of 2-D lookup table block are T and b, how to achieve it? is it possible?
a=[1 2 3];b=[4 5 6];T=[1 3 5;2 4 6;3 4 5]; a and b as the inputs of lookup table ,output is the value of T, when inputs is 1 and 4,we can got T=1
what I want to do is: T and b as the inputs of lookup table ,output is the value of a,there still don't know their relation.
can you got my idears?
I'm sorry my writting english is so bad.

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2017. All Rights Reserved.