FIND requires variable sizing

i am facing a problem of "Find requires variable sizing" whenever i compile my matlab function block of simevents. the scenario is simple that is i have to fimd the indexes from an array using find function: min_loc = find(pat_w_time(:,k)==min(pat_w_time(:,k)));

i have tried to google it a lot and also tried to search mathworks but all in vain moreover i have also tried code.varsize and emel.varsize but agian i am getting error. help appreciated

[Kaustubha Govind]

Could you post a simplified version of your function with use of coder.varsize? Is min_loc an output of the block, or just a local variable?

[Idrees Idrees]

thanks for prompt reply the simplified version of code that i tried are

version 1

coder.varsize('min_loc', [1, inf])

%%%%code to calculate pat_w_time %%%

min_loc = find(pat_w_time(:,k)==min(pat_w_time(:,k)));

here inf because in case upper bound is not known

version 2

coder.varsize('min_loc', [1, 20])

%%code to calculate pat_w_time %%%

min_loc = find(pat_w_time(:,k)==min(pat_w_time(:,k)));

here 20 because i know that pat_w_time has maximum size of 1*20

but i get error

"The coder.varsize() built-in function can only be used when support for dynamic matrices is turned on."

although its solution seems to be available at http://www.mathworks.com/help/releases/R2011b/toolbox/simulink/ug/br9_55w.html but i cannot access it

min_loc is neither output nor input to my matlab function block it is just created inside the block to get the location of minimum values from an array of pat_w_time so that further inferences can be made upon.

[Idrees Idrees]

it must be noted that i am using attribute function block of simevents

Answer 1

[Andrew Reibold]

Have you tried what this guy did for a similar situation?

http://stackoverflow.com/questions/19369205/matlab-error-find-requires-variable-sizing

[Idrees Idrees]

firstly thanks for prompt reply Yes the link provides nearly two solution first one is " I used a fixed matrix and it finally fixed the issue." i tried to define a fixed size array of various lengths like 1*1, to 20*1 as my pat_w_time has maximum 20 values for which i get "Size mismatch" error because i don't exactly know how much locations find will return... while the second one is given at "See this newsgroup post for one explanation." "http://newsgroups.derkeiler.com/Archive/Comp/comp.soft-sys.matlab/2009-03/msg01457.html" in which it is clearly stated that one cannot get good results as find can give by the second method for which i am afraid off.

but my problem although looks same like the one indicated by the link given but yet unable to solve it according to the said methods

[Idrees Idrees]

it must be noted that i am using attribute function block of simevents