Replace values at certain positions (positions given in an array, as well as new values)

Hello, my problem is the following: I have a Matrix A with a lot of data and some values need to be replaced. I have two additional arrays, one which leads to the positions in A where the new value belongs, and one which contains the new value for the position in A. Can someone help me? Thanks in advance

Answer 1

[Adam]

A(B) = C;

should work if B are the locations and C the values, provided they are the same length and contain valid indices and all the usual constraints.

[Joel Bly]

how did you think this was helpful? sigh. I have the same question and I can't find it anywhere. i have an array that from a for loop and I need to basically make the numbers placed in the position they were in the previous array. Except every number that doesn't come back in each row as the number in the first array, I want to be changed to zero or a [NaN]. I have been at this damn thing for at least 2 weeks. now and I'm so over it. please help me.

[Adam]

Apparently you don't have the same question if you don't find the answer to it helpful! You should start a new thread for a new question with an example of what you are trying to achieve since it is apparently different to what the person asking this question wanted.

[Joel Bly]

you could have just helped me out or answering the question up top. instead of writing this. that wasn't helpful either. my question is the same. I want to change the value of numbers or text in certain position. indexing doesn't actually work when you have huge data with some values in different places that you want to keep. that's why it's not helpful.

[Adam]

My response is still the same! My answer answered the question that was asked. That was its only purpose. If your question were the same then so would the answer be. Since you haven't given an example I don't understand what aspect of your question is different to the original question which was trivial, hence why the answer was trivial.

If you open a question thread then you will likely attract answers from a much wider range of people. Most people other than me won't read this thread and I don't understand your question.

You can keep telling people they are unhelpful as much as you like, but if you are unhelpful in not giving clear details of your own question people are not mind readers.

[Duncan L]

I think what they mean that they want to replace only certain indices (specified by logical array B) in the array A from values from array C, not replacing all values from array C.

This can be done by:

A(B) = C(B);