How to plot different length of vectors?

for k=1:3000
    xvalue1(k)=k;
end

for k=1:2999
    xvalue(k)=k;
end
figure;
d5=X_est(5,:);
plot(xvalue,d5);
hold on,
plot(wr);
legend('estimated value','actual value');

[Adam Danz]

Both for-loops can be reduced to 1 line.

for k=1:3000
    xvalue1(k)=k;
end
% Becomes 
xvalue1 = 1:3000; 

I don't know the size of "d5" but assuming it's a vector shorter than 3000, how would you like to deal with the extra data? Should it be trimmed from the end, from the beginning? Do the vectors have any 1:1 correspondance?

[Zin Ko Khaing]

size of d5 is 2:3000

size of wr is 1:3000

I want to trim from 2 to 3000

[Adam Danz]

Now I'm totally lost.

"2:3000" isn't a size. is d5 a matrix with 2 rows and 3000 columns?

[dpb]

"2:3000" is a vector index expression of 3000-2+1-->2999 elements which is one off 3000...

The language is a barrier here...

Zin Ko, simply write

wr(2:3000)

to reference the elements other than the first.

If you want to eliminate that first element entirely, then just overwrite wr

wr=wr(2:3000);

More generically and better practice to not bury "magic numbers" in code would be

wr=wr(2:end)

[Adam Danz]

I see. So, in this line

plot(xvalue,d5);

xvalue is a vector of length 3000 and d5 is a vector of length 2999.

Assuming there's a correspondance between these variables except for the first or last value, you can just trim the extra values. This often happens when differentiating, for example.

plot(xvalue(2:end), d5)
% or
plot(xvalue(1:end-1), d5)

These will "work" (they won't cause an error) but it's up to you to make sure they conceptually work.

Answer 1

[dpb]

for k=1:3000
    xvalue1(k)=k;
end

MATLAB is MATrix LABoratory -- use vector facilities...

xvalue1=1:3000;

figure;
d5=X_est(5,:);
plot(xvalue,d5);
hold on,
plot(wr);
legend('estimated value','actual value');

What is size(d5)?

If you are going to plot an x vs y, then the two must be of corresponding sizes, yes. You can either pick to plot the number of elements of the longer that matches the shorter or you can augment the shorter to the size of the longer with NaN which will be silently ignored by plot and friends. But, they must be commensurate in size

plot(wr) by itself will plot the elements of the array/vector wr against their ordinal number so doesn't matter how many elements there are in it...since you just use 1:N for a chosen N for the other plots, they could also just use the one-argument form and wouldn't have to worry about the lengths, specifically.

All depends upon what the data really represent and what you're trying to show which you don't supply sufficient context to be able to tell...