Unable to set the scale fro -inf to inf

Hi,

I am trying to plot 2 arrays but I am not getting the expected result. I am sure I am making some mistake but I am unable to identify it.

x = [1	0.93	1	0.96	1	1	1	0.86];
snr = [Inf	9	-0.539	-4.98	-7.9	-10.08	-11.83	-13.28];

plot(snr,x)
ylim([0 1])

xlim([-inf inf])

Firstly, the plot is missing the value at 'inf' which is 1 and second, I am trying to make the scale of x axis from -inf to inf but that is not working.

I am actually trying to make the x axis ticks as [ -inf -15 -10 -5 0 5 10 15 int] but i am still trying to figure out how to do that.

Can someone help me with this. Any help is appreciated.

Thank you

Answer 1

[Sulaymon Eshkabilov]

Note that [inf -inf] will make your plot hardly visible and thus, you had better take a bit larger values to the two extreme points, e.g.:

x = [1	0.93	1	0.96	1	1	1	0.86];
snr = [Inf	9	-0.539	-4.98	-7.9	-10.08	-11.83	-13.28];

plot(snr,x, 'ro-', 'linewidth', 2), grid on
ylim([0 1])
xlim([-25  25])
xticks([-25 -15 -10 -5 0 5 10 15 25])
xticklabels({'-inf', '-15', '-10', '-5', '0', '5', '10', '15', 'inf'})

[Raghav Rathi]

That was really helpful thanks a lot. But why is the value corresponding to 'inf' which is '1' not being plotted?

[Sulaymon Eshkabilov]

Here is how you can make it visible:

x = [1	0.93	1	0.96	1	1	1	0.86];
snr = [-25	9	-0.539	-4.98	-7.9	-10.08	-11.83	-13.28];
[SNR, IND] = sort(snr);
X = x(IND);
plot(SNR,X, 'ro-', 'linewidth', 2), grid on
ylim([0 1])
xlim([-25  25])
xticks([-25 -15 -10 -5 0 5 10 15 25])
xticklabels({'-inf', '-15', '-10', '-5', '0', '5', '10', '15', 'inf'})