Replacing elements in a matrix with Scalers

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Jalashwa
Jalashwa 2015-5-17
评论： Image Analyst 2015-5-17
Hi Guys,
Need your quick help regarding an assignment question. The question is as follows:
The function differ is defined like this:
function w = differ(v,a,b,c)
The first input argument v is a vector, while a, b, and c are all scalars. The function replaces every element of v that is equal to a with b and c. For example, the command
>> x = differ([1 2 3],2,4,5);
makes x equal to [1 4 5 3]. If c is omitted, it replaces occurrences of a with two copies of b. If b is also omitted, it replaces each a with two zeros.
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Geoff Hayes
Geoff Hayes 2015-5-17
Jalashwa - since you have tried out different scenarios, then you must have written some code. Please post it and the MATLAB community can respond with suggestions on how best to go about solving the problem.
Jan
Jan 2015-5-17
@Jalashwa: Please post what you have tried so far and ask a specific question. The forum will not solve your homework.

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回答（2 个）

Image Analyst
Image Analyst 2015-5-17
Here's some help : http://www.mathworks.com/matlabcentral/answers/8626-how-do-i-get-help-on-homework-questions-on-matlab-answers Other than that I suggest you look up find() in the help, and look up isempty(), the "if statement", and logical comparisons like "==" if you need to review them. Also look up indexing so you'll know what expressions like v(1:n) and v(m:end) mean. After you've written some code, if you still need help with error messages then read this first and look at this and if you still have trouble, come back here.
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Jalashwa
Jalashwa 2015-5-17
Image Analyst, i am just a beginner and this Assignment is really important. I am trying again with the hint you have given me. May i request you to give me some more clarity please....
Image Analyst
Image Analyst 2015-5-17
Here's a little bit more
function w = differ(v,a,b,c) % What your teacher gave you already.
w=strrep(v, a, [b,c]); % Trick I told you about
You can use nargin and vargin to handle situations where b and/or c are not present. Look those up in the help. I can't really help anymore without basically doing the whole thing for you.

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Walter Roberson
Walter Roberson 2015-5-17
To detect whether an argument is present or not, look at exists()

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