How to read a character from a script and extract the number in the same line.

1 view (last 30 days)
[ Figure 1 ]
[ Figure 2 ]
Hello.
In cell d of Figure 1, I created a script as shown in Figure 2 to output the number corresponding to the same row as 'Failed' among the characters in the first column.
However, on line 3 of the script, an error occurred stating that the expression on the left of = is not valid.
I don't understand why it's not valid, so I'm asking.
thank you.

Accepted Answer

Walter Roberson
Walter Roberson on 8 Apr 2022
Edited: Walter Roberson on 8 Apr 2022
In MATLAB statements, there are four ways that = can be used:
  • there can be a simple or indexed variable or list of simple or indexed variables in [], then a single = and then a function call or expression whose output is to be assigned to what occurs on the left
  • There can be a statement that starts with for and then an un-indexed variable, and then a single = and then an expression; this creates a for loop
  • Inside a () parameter list for a function call, there can be a simple unindexed variable name, then a single = and then a value; this is the same as using a name/value pair A=B being the same as "A", B
  • You can have a pair of equal signs together, == to express a necessary logical relation
Your code uses a single = in the context of an if . That is not an assignment statement, not a for loop, and there is an indexed expression to the left of the = so this cannot be a shortcut for a name/value pair.
You should have used == to express the logical relation for the test.
However... you have the further problem that == is not defined between cell array elements. You can fix this in any of the following ways:
  • if isequal(d(i,j), {'Failed'})
  • if string(d(i,j)) == "Failed" %notice the double quotes
  • if strcmp(d{i,j}, 'Failed')
  • if d{i,j} == "Failed" %notice the double quotes

More Answers (0)

Categories

Find more on Graphics Object Identification in Help Center and File Exchange

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!