Adding to variable dependant on condition

i have a table and am checking if values lie within this range 60<=a<70, if they do i want to add 1 to another variable "x" so that x will represent the number of values within this range. using an elseif function how would i do this, thanks!

for a = 1:length(x)
    if a >= 60 && a <70

[Tommy]

How about just

x = sum(a >= 60 & a < 70)

[Holden Earl]

i have to use an if-elseif statement, and wouldnt that give me the sum of numbers over and 60 and under 70, not the range inbetween?

[Holden Earl]

for a = 1:length(x)
    if a >= 60 && a <70
        x + 1;
    else
    end
end

this is what i want to do im just not sure of the syntax?

[Tommy]

It would give the number of values which are simultaneously over 60 and under 70, as

a >= 60 & a < 70

would return a logical array, containing a 1 at each value of a between 60 and 70 and a 0 at each other value.

Using an if-else statement would look something like this:

x = 0;
for a = range
    if a >= 60 && a < 70
        x=x+1
    else
        % do nothing
    end
end

(edit after seeing your above comment) Make sure to reassign x with x+1. Additionally, it seems like x is playing two different roles in your code. If you are going to use

for a = 1:length(x)

then you might want to use a different variable for counting, such as

y=y+1;

Also note the else statement is unnecessary:

for a = 1:length(x)
    if a >= 60 && a <70
        y=y+1;
    end
end

[Walter Roberson]

You are calculating x+1 and throwing the result away instead of recording the result of the addition.

If a is the vector of values to be checked, you should probably not be using for a . You should probably be using an index into a, like for idx = 1 : length(a) and checking the value of a indexed at that variable.

[Holden Earl]

thats got it, thanks guys!