Error: The expression to the left of the equals sign is not a valid target for an assignment.

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Ycomfort=str2func(strcat('@(x,T_set_r,T_room_m,T_room_mm,DT_m,DT_L,DT_U,T_room,Gt,dc,Q_HVAC,N_slot,T_set_w,dT_L,dT_U,Tw_m,Tw_mm,f_t,G,Bt,Rt,dT_m,T_w,T_env,T_n,Q_CHPU)',Fcomfort));
Error: The expression to the left of the equals sign is not a valid target for an assignment.
  5 Comments
Walter Roberson
Walter Roberson on 29 Aug 2019
The most common cause for this problem is that you are in the middle of a [ or { matrix definition, that you forgot a ] or } or accidentally commented it out

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Accepted Answer

Stephen23
Stephen23 on 30 Aug 2019
Edited: Stephen23 on 30 Aug 2019
As Walter Roberson already wrote, the problem is most likely caused by unmatched curly braces or square brackets earlier in the code. This error is easy to demonstrate, e.g. in a script which mimics your code flow:
baz = @(a,b)a+b;
str = 'baz(a,b);';
vec = {1,2,; % !!! unmatched curly brace !!!
foo = str2func(strcat('@(a,b)',str));
foo(2,3)
which when run throws exactly the error that you are getting:
>> temp5
Error: File: temp5.m Line: 6 Column: 5
The expression to the left of the equals sign is not a valid target for an assignment.
Here is a much simpler demonstration of this error, showing that the error is unrelated to str2func or strcat or functions in particular:
vec = {1,2,; % !!! unmatched curly brace !!!
foo = 23
giving:
>> temp5
Error: File: temp5.m Line: 5 Column: 5
The expression to the left of the equals sign is not a valid target for an assignment.
Solution: check your brackets/braces !

More Answers (1)

Mahesh Taparia
Mahesh Taparia on 30 Aug 2019
Edited: Mahesh Taparia on 30 Aug 2019
Hi,
You can use the below command:
Ycomfort=str2func('@(x,T_set_r,T_room_m,T_room_mm,DT_m,DT_L,DT_U,T_room,Gt,dc,Q_HVAC,N_slot,T_set_w,dT_L,dT_U,Tw_m,Tw_mm,f_t,G,Bt,Rt,dT_m,T_w,T_env,T_n,Q_CHPU)Fcomfort(varargin)');
Where Fcomfort is the function of the mentioned variables.
You can refer the below link for more help for str2func:
  10 Comments
Rik
Rik on 30 Aug 2019
@Mahesh can you try to make an example with your syntax that can actually run without errors? Whenever I get questioning comments from other users, I always make sure that the code I'm suggesting runs at least on my system.
Walter Roberson
Walter Roberson on 30 Aug 2019
You can code
Ycomfort=str2func('@(x,T_set_r,T_room_m,T_room_mm,DT_m,DT_L,DT_U,T_room,Gt,dc,Q_HVAC,N_slot,T_set_w,dT_L,dT_U,Tw_m,Tw_mm,f_t,G,Bt,Rt,dT_m,T_w,T_env,T_n,Q_CHPU)Fcomfort(x,T_set_r,T_room_m,T_room_mm,DT_m,DT_L,DT_U,T_room,Gt,dc,Q_HVAC,N_slot,T_set_w,dT_L,dT_U,Tw_m,Tw_mm,f_t,G,Bt,Rt,dT_m,T_w,T_env,T_n,Q_CHPU)');
but remember that the effect of that would be to index the character vector fcomfort, not execute a function named fcomfort.

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