x=linspace(0,pi,100) and x=0:0.01:pi

what is different with x=linspace(0,pi,100) and x=0:0.01:pi??

Answer 1

[Image Analyst]

Does this help?

x1 = linspace(0,pi,100) % 100 elements with spacing to be determined (it's pi/100)
x2 = 0:0.01:pi          % N elements with spacing of 0.01, but N to be determined (it's 315)
fprintf('      x1        x2\n')
for k = 1 : length(x2)
	if k <= length(x1)
		fprintf('%10.4f', x1(k));
	else
		fprintf('          ');
	end
	fprintf('%10.4f\n', x2(k));
end

You'll see in the command window:

x1 x2

0.0000 0.0000

0.0317 0.0100

0.0635 0.0200

0.0952 0.0300

0.1269 0.0400

0.1587 0.0500

Does that clarify it?

[Allan Lee]

thanks i understand now

Answer 2

[madhan ravi]

linspace creates vector from to 0 to pi with 100 numbers

The other creates a vector with a step .01.

Please read the below documentations:

doc linspace
doc colon

[Allan Lee]

linspace is similar to the colon operator, “:”, but gives direct control over the number of points and always includes the endpoints

what is this mean?thank you

i still can not understand why is different

[Walter Roberson]

Also, there are some differences in how the two handle round-off error.

linspace calculates the average step size, and then each entry is the first entry plus an integer multiple of the step size.

The colon operator controls for round off from the middle, calculating the first half and second half separately to try to reduce drift.

[madhan ravi]

Thank you sir Walter.