Menu
MATLAB is a pass by value language. I have a recursive function that processes pixel's neighbors. It is very expensive to make the copy of the image (in my case two images) each time the function is called.
I used global variables to solve the problem. Is there any other way to make a recursive function modify an array?
965
You click the formula in the cell or formula bar and you can't change a thing. Array formulas are a special case, so do one of the following: If you've entered a single-cell array formula, select the cell, press F2, make your changes, and then press Ctrl+Shift+Enter..
Arrays can be manipulated by using several actions known as methods. Some of these methods allow us to add, remove, modify and do lots more to arrays.
Passing Arrays To Function Instead, we pass the pointer to the array i.e. the name of the array which points to the first element of the array. Then the formal parameter that accepts this pointer is actually an array variable. As we pass the pointer, we can directly modify the array inside the function.
Pass Individual Array Elements To pass individual elements of an array to a function, the array name along with its subscripts inside square brackets [] must be passed to function call, which can be received in simple variables used in the function definition.
You have three options here, but maybe you don't need any of them, since Matlab used 'copy-on-write', i.e. variables are only copied if you modify them.
blockproc, or im2col to rewrite the function.Finally, if you want to stay with your current scheme, I strongly suggest using persistent variables instead of globals.
153
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
