Re: Multiple case function error

[Harishkumar U]

This is what I have done now

x = {d = 3, e = 4, f = 5};
a = {g = 7, h = 2, i = 6};
b = {k = 8, l = 1, m = 9};

d = x(1,1);
e = x(1,2);
f = x(1,3);
g = a(1,1);
h = a(1,2);
i = a(1,3);
k = b(1,1);
i = b(1,2);
m = b(1,3);

y = input('enter a value: ');
switch(y)

case d
  xpos ={d, h, m};
  xneg ={k, h, f};
 
  ss = input('enter cross value: ');
 
case g
  xxpos = {g, h, d};
  xxneg = {f, i, e};
 
  ss = input('enter cross value: ');

endswitch

if (ss = xpos && xxpos)


  max = d+h;
  disp(max)
 
else
 
  min = g-f;
  disp(min)
 
endif

but now, I am getting these errors

enter a value: d
enter cross value: h
error: invalid conversion from cell array to logical value
error: called from
    crossminmax at line 32 column 1

enter a value: d
error: binary operator '==' not implemented for 'cell' by 'scalar' operations
error: called from
    crossminmax at line 16 column 1

On Thu, Apr 2, 2020 at 12:05 PM Harishkumar U <address@hidden> wrote:

Thank you! I changed cross variable name. Yes, switch y block input should match the output of cross block to obtain either xpos or xneg value. But, when I use 'd' its ignoring the case statement and skipping forward. Can I use If else condition? something similar to switch case statement though 

On Thu, Apr 2, 2020 at 2:14 AM Nicholas Jankowski <address@hidden> wrote:

On Wed, Apr 1, 2020 at 1:31 PM harish3679 <address@hidden> wrote:

Hi,

I am trying to use multiple cases for a math operation using case{..,..} as
per octave reference. But unfortunately I am getting an error
'enter a value: d
enter cross value: h
error: 'xxpos' undefined near line 24 column 13
error: called from
    crossminmax at line 22 column 1'

I've had some trouble even trying to recreate your error.  

1 - did you define some values for d, etc, outside of what you showed? because if I run your script from a clean workspace i get:

enter a value: d
error: 'd' undefined near line 1 column 1
error: called from
    casetest at line 3 column 3

i notice some other things.  You use cross as a variable name, but it is the name of a function for performing a vector cross product.  so if the first switch doesn't set a value to overwrite the meaning of cross, you get an error calling the switch(cross) line. 

do you mean for your switch(y) block to match the letter input d or g?  in that case you need it to be defined as a character with quotation marks,  'd', or "d".  Of course, then it's not clear what values will be going into xpos or xxpos.

look at the help for switch with:  >> help switch

--

Harish Kumar

M: +91 9488309620, Whatsapp: +91 9944308505

E: address@hidden

A:

15/36, Ramanna Layout 2, Bharathi Park Road 2, 

Saibaba Colony, Coimbatore -641 043. Tamil Nadu, India

--

Harish Kumar

M: +91 9488309620, Whatsapp: +91 9944308505

E: address@hidden

A:

15/36, Ramanna Layout 2, Bharathi Park Road 2, 

Saibaba Colony, Coimbatore -641 043. Tamil Nadu, India