How do I put in a range of negative numbers?

Question

Tom 2011-11-25

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https://ww2.mathworks.cn/matlabcentral/answers/22277-how-do-i-put-in-a-range-of-negative-numbers

回答： Disha Patel 2018-12-12

I've got this script: -

m=2
g=9.81
k=0.5
c=sqrt((m*g)/k)
v=[-6.264183904]
t=(-1*(c/2)*log((c+v)/(c-v)))/g
plot(v,t)

and I want my values for v to be equal to a range of values going from -c to 0. I can't seem to make it do it for some reason.

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Answer 1

Image Analyst 2011-11-25

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Try linspace, like this:

m=2
g=9.81
k=0.5
c=sqrt((m*g)/k)
v=linspace(-c, 0, 100);
t=(-1*(c/2)*log((c+v)./(c-v)))/g;
plot(v,t, 'bo-');
grid on;
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1])

Note that because v is now an array some of the slashes needed to be changed to dot slashes.

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Tom 2011-11-25

That's great thanks. I get the linspace command now I think. What's 'bo-'? And would you mind just explaining the bottom line a bit? Thanks again.

Walter Roberson 2011-11-25

'bo-' is Blue lines with circular ("o-shaped") markers, using solid lines to connect the points.

Outerposition is difficult to explain. You can read the documentation about it, http://www.mathworks.com/help/techdoc/ref/axes_props.html#OuterPosition but I find it difficult to manipulate Innerposition and Outerposition to get predictable results.

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Answer 2

Disha Patel 2018-12-12

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https://ww2.mathworks.cn/matlabcentral/answers/22277-how-do-i-put-in-a-range-of-negative-numbers#answer_352025

在 MATLAB Online 中打开

I have got this script :

close all;
clear all;
clc
n = -10:1:-1;
u(n)= 1;
p=(0.25).^(n).*u(n);
plot(n,p);

I want to scatter function "p" in negative side of the x axis so what should I do if I run this code the error seems like there should be positive and logical value of the variable "n" could anyone help me out of this?