Linspace is changing my function values

Hello,

Maybe I do not understand fully what linspace does but when I change my from:

t = linspace(0,250)

to

t = linspace(0,1000)

my output values change. One of my functions (with the most noticeable trend) is:

Pe_po = eta*R_po*m_po*1000*.5.^(t/HL_po);

which is a plot of the electrical power decay in thermoelectric generator using a Polonium-210 radioisotope source. The output increases about 4 fold while the other graphs seem to remain the same but that may be due to their longer half-life.

What I am trying to do is increase the x-axis plotting but this is what I get instead:

t = linspace(0,250)

t = linspace(0,1000)

I am using the Student Version and have some limited Matlab experience (probably less than I should).

Am I using linspace worng or do I need an entirely differen function to graph with?

[Stephen23]

@Taylor Shead: please edit your question and show us your plot command.

Answer 1

[Star Strider]

The linspace function by default produces a vector of 100 elements, so it increments the elements proportionately.

The element intervals are:

ElInt = (maxv - minv)/(len-1)

where ‘maxv’ is the maximum value desired, ‘minv’ is the minimum (starting) value, and ‘len’ is the number of elements, in:

v = linspace(minv, maxv, len);

If you want the same element spacing in your longer vector, this works:

t = linspace(0,1000, 397);

Experiment to get the result you want.