[~,ant_est] = max(abs(z));

When i used this above code in my matlab version 2009a it is showing an error Expression or statement is incorrect--possibly unbalanced (, {, or [.

help me to correct it

[Massimo Zanetti]

Most probably the error is not related to this line of code. Please, post more details (e.g., the piece of code and the whole matlab error message, including the line at which the error is found).

[James Tursa]

I.e., several lines above and below the offending line.

Answer 1

[Walter Roberson]

The ~ operator was not implemented until R2009b. You can replace that code with

[UnUsEdVaRiAbLe_To_IgNoRe, ant_est] = max(abs(z));
clear UnUsEdVaRiAbLe_To_IgNoRe

[Jan]

I've used:

[dummy, ant_est] = max(abs(z));

and omitted the clearing usually. But this might occupy memory until the function is finished.

[Kartickeyan V]

when i use this code the program stuck in busy mode

[Walter Roberson]

Your z might be very large. You might be running low on memory. abs(z) is going to need to make a temporary variable the same size as z, and possibly your variables are so large that you are forcing your system to swap when you do that.

[Jan]

@Kartickeyan V: That the code needs time to run has no relation to using a temporary variable to ignore the 1st output of max.

You can use the profiler to find out, which commands takes the time.

[Adam]

Don't clear the variable if time is more of an issue than memory. clear instructions take a lot of time, relatively.

[Walter Roberson]

I would be unlikely to clear the junk variable myself, unless I was short on memory. The "clear" I showed is the logical equivalent, not the practical equivalent.