how to solve the probelm that an input variable will be cleared in a loop in the definition of a matlab function?

Hi,

I'm a novice in matlab.

I encounterd two problems while trying to define a function.

First, the input variable that is a single number cannot be recognised as numeric in the function statements.

Second, I don't know why the input variable will be cleared in a loop...like the below loop...in this settings, I tried to define a function that looks like [output1 output2]=function(*****,A,****). However, while calling this function, it will report error that "reference to a cleared variable A" in the second iteration for the loop (marked by red circle)...

Wish somebody could help me to solve these two confusing problems！

[Stephen23]

"Wish somebody could help me to solve these two confusing problems！"

Please upload your function by clicking the paperclip button.

While screenshots are very pretty, we cannot run screenshots, we cannot edit screentshots, we cannot search screenshots, we cannot paste screenshots into the MATLAB Editor and use the code checking tools...

[Yovan Ho]

So, you mean my problems are not general, they are particular in my function definition? I thought they were common for a novice to define a function containing several loops...

[Stephen23]

"you mean my problems are not general, they are particular in my function definition?"

Perhaps, but at this point I cannot say why becase so far you have not provided us with the information required for us to understand the problem. That is why as a starting point I asked for you to upload the function file.

[John D'Errico]

What you have not shown, for example, is where is A defined? Where does the variable A get created and used? You don't show that it was passed in. Provide the code, not just a limited picture of the code.

[Yovan Ho]

Many thanks to Stephen and John! I have attached the code below. I will quite appreciate that if you could take time to have a look! Thank you very much!

[Yovan Ho]

A is a cell structure that contains a number of square matrix...

[Yovan Ho]

Besides, I want to set Num_ROIs and partitionTimes as the input variables of this function, but I don't know why the code like

"Smatrix_output=zeros(Num_ROIs,length(A),partitionTimes,Num_omega,Num_gamma);"

cannot recognise these two variables as numeric when I called this function to run (I had assigned intergers to them ).

Answer 1

[Steven Lord]

In general, you shouldn't need to call clear in a function. In those situations where you must, strongly prefer calling clearvars (or clear with the name of a variable as input) to clear a specific variable rather than calling clear with no input arguments which clears everything.

In this case, delete the call to clear with no inputs in your code. Examine your two calls to clear with an input argument to determine if they are truly necessary.

[Yovan Ho]

Hi Steven

Thank you very much! It did help! I was so careless that made such a mistake. Many thanks!!!

I wonder if you could help me to solve another problem:

I want to set Num_ROIs and partitionTimes as the input variables of this function, but I don't know why the code like

"Smatrix_output=zeros(Num_ROIs,length(A),partitionTimes,Num_omega,Num_gamma);"

cannot recognise these two variables as numeric when I called this function to run (I had assigned intergers to them ).

So, I can only assign these two variables inside this function instead of defining them as

[output1 output2...]=function(...Num_ROIs,partitionTimes ...)

I will quite appreciate that if you could give me some tips.

[Steven Lord]

Show us the code you ran to define those variables and/or the output of whos executed immediately before that call to the zeros function executes.

[Yovan Ho]

Sorry, I didn't realize the code I attached in the comment above cannot be viewed.

I have attached them in this message.

It will report errors about the aforementioned zeros function once I run the script (dFC.m) which calls the function multilayerNetFunc.

Variables Num_ROIs & partitionTimes are set as part of the input variables of multilayerNetFunc.

I am grateful for your patience to help me check the problems!

[Yovan Ho]

Hi

I have found the source of the problem. I didn't type the right characters to call the multilayerNetFunc function so that I encountered that problem. I should pay more attention to the details of writing codes.

Thank you for the help!