trying to convert IDL codes to MATLAB

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hasan alhussaini
hasan alhussaini 2017-8-8
评论： Kris Fedorenko 2017-8-25
Hi i'm trying to create a similiar code on matlab to the one i have in IDL
Basically the code lets you select a box_cursor over a region of an image or select the x,y,nx,ny deminsions
the IDL codes are
roichox:
print,'PLEASE SELECT YOUR REGION OF INTEREST: 1=box, 2= enter values'
read,roichoice
case roichoice of
1: begin
box_cursor,x,y,nx,ny
print,"Margins and dimensions:",x,y,nx,ny
end
2: begin
print, 'x?'
read,x
;print, 'y?'
;read,y
print, 'nx?'
read,nx
;print,'ny?'
;read,ny
end
else: goto, roichox
endcase
my translation so far is
roichoice=input('PLEASE SELECT YOUR REGION OF INTEREST: 1=box, 2= enter values\n');
switch( roichoice)
case 1
[I ,rect]=imcrop();
yb=rect(1);
xb=rect(2);
nyb=rect(3);
nxb=rect(4);
fprintf('Margins and dimensions: x=%f y=%f nx=%f ny=%f',xb,yb,nxb,nyb);
case 2
xb=input('x?');
nxb=input( 'nx?');
otherwise
goto(roichox);
return
end
  2 个评论
John D'Errico
John D'Errico 2017-8-8
You used goto? No goto in MATLAB. Try again.
dpb
dpb 2017-8-9
As John says, there is no GOTO in Matlab; leave the otherwise clause empty and enclose the block in a while loop. Use break when get a valid response to exit the block and go on to next step.

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采纳的回答

Kris Fedorenko
Kris Fedorenko 2017-8-11
编辑：Kris Fedorenko 2017-8-11
As dpb said above, you can use a while loop instead of "goto", which does not exist in MATLAB. Here is one possible example of how you can make it work:
roichoice=input('PLEASE SELECT YOUR REGION OF INTEREST: 1=box, 2= enter values\n');
while ~((roichoice == 1) || (roichoice == 2))
disp('You must enter either 1 or 2')
roichoice=input('PLEASE SELECT YOUR REGION OF INTEREST: 1=box, 2= enter values\n');
end
switch( roichoice)
case 1
[I ,rect]=imcrop();
yb=rect(1);
xb=rect(2);
nyb=rect(3);
nxb=rect(4);
fprintf('Margins and dimensions: x=%f y=%f nx=%f ny=%f',xb,yb,nxb,nyb);
case 2
xb=input('x?');
nxb=input( 'nx?');
end
Hope this helps! And YAY for switching from IDL :)
  2 个评论
hasan alhussaini
hasan alhussaini 2017-8-25
Hi Kris, i was wondering how would you go about changing the code from imcorp to imrect or rbbox?
Kris Fedorenko
Kris Fedorenko 2017-8-25
Hi Hasan,
The difference would be in what these functions return:
  • imrect returns a handle to an imrect object. Based on the documentation, you can get the x,y position and dimensions by using a "getPosition" function. For example:
rectHandle=imrect();
rect = getPosition(rectHandle);
where rect(1) is x position, rect(2) is y position, rect(3) is width, and rect(4) is height.
  • rbbox returns a four-element vector, [x y width height], where x and y are the x and y components of the lower left corner of the box, and width and height are the dimensions of the box. But rbbox returns immediately if a button is not currently pressed. You can use rbbox with waitforbuttonpress, so that rbbox returns when you release the mouse button:
waitforbuttonpress
rect = rbbox();
Another difference is that rbboc would define the box in the coordinates of the figure rather than in the axes coordinates.
Hope this helps!
Kris

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