Question about making a function file with vectors and variables

Question deleted by James. Partially restored by Matt Fig:

a part of my program has syntax that looks like this,

for n=1:1:A1 if (Z(n)<3 | Z(n)>9 | Z(n)~=Z(n)) disp('One or more of the element/s is/are not included.'); return;

elseif ~isnumeric(Z(n)) disp('There is error') return; end

so if i enter:

function_name ([3 4 A], [4 5 6])

matlab says: Undefined function or variable 'A'.

[Jan]

Why do you delete your question? Then the work of the once, who wanted to help you, is lost. Not friendly.

[Matt Fig]

OP:

a part of my program has syntax that looks like this,

for n=1:1:A1 if (Z(n)<3 | Z(n)>9 | Z(n)~=Z(n)) disp('One or more of the element/s is/are not included.'); return;

elseif ~isnumeric(Z(n)) disp('There is error') return; end

so if i enter:

function_name ([3 4 A], [4 5 6])

matlab says: Undefined function or variable 'A'.

Answer 1

[Wayne King]

MATLAB will do that on its own.

 >> clear A % in case A is in the workspace
 >> a=[1 2 A 4]

The MATLAB error message will be:

 Undefined function or variable 'A'.

[Portgas Ace]

but im using a function file. im only required to input a vector with only numbers as value and if i entered a non-number, i should show an error. so ex, a = [1 2 A 4]; there should be an error saying ive entered a wrong input. something like that. :(

Answer 2

[Wayne King]

If A is not a variable in the workspace, then inputting it into a function will cause an error

 function sumout = testfunction(input1 )
 sumout = sum(input1);
 end

If you call that function with

 >>sumout = testfunction([1 2 3 A 4]);

throws an error. You can always use isnumeric() if you want

 if ~isnumeric(input)
 error( ) 
 end

[Portgas Ace]

hope this solves my problem. thank you! :D

Answer 3

[Jan]

After A = 1; a = [1,2,A,4]; there is no method to detect, if a has been created using numbers, functions or other variables. When A is e.g. a character array, it is converted to double implicitly:

A = 'Z';
a = [1, 2, A, 4]   % ==> [1, 2, 90, 4]

Here A is converted to the type DOUBLE and the ASCII value 90 is stored. Afterwards a is a double vector as all its elements have the same type.

I think, you have a different problem. Perhaps you want to test the class of A before inserting into the vector.

Answer 4

[Portgas Ace]

a part of my program has syntax that looks like this,

for n=1:1:A1 if (Z(n)<3 | Z(n)>9 | Z(n)~=Z(n)) disp('One or more of the element/s is/are not included.'); return;

elseif ~isnumeric(Z(n)) disp('There is error') return; end

so if i enter:

function_name ([3 4 A], [4 5 6])

matlab says: Undefined function or variable 'A'.