# Vector re-size
**URL:** https://discourse.julialang.org/t/vector-re-size/13733
**Category:** General Usage
**Created:** [August 19, 2018, 9:27pm UTC](https://discourse.julialang.org/t/vector-re-size/13733 "2018-08-19T21:27:39Z")
**Posts on this page:** 10
**Page:** 1
### Author:  [@microlifecc](https://discourse.julialang.org/u/microlifecc)
#### Post date: [August 19, 2018, 9:27pm UTC](https://discourse.julialang.org/t/vector-re-size/13733/1 "2018-08-19T21:27:39Z")
So I have two vector of vectors like:
> matchings\_vec = Vector{Vector{Vector{Vector{Any}}}}(num\_tilt1)
> Minfoall\_vec = Vector{Vector{Vector{Vector{Vector{Vector{Float64}}}}}}(num\_tilt1)
I defined it as:
```julia
matchings_vec = [Vector{Any} for i in 1:num_tilt1]
Minfoall_vec = [Vector{Float64} for i in 1:num_tilt1]
```
Then I am trying to resize the inner vectors like:
```julia
for tt = 1:num_tilt1
t_tt = t[tt]
if t_tt == 1
num_rot1 = 1
else
num_rot1 = round(Int, num_rot_t2 * t_tt/2)
if rem.(num_rot1, 2) == 1.0
num_rot1 += 1
end
num_rot1 /= 2
end
resize!(matchings_vec[tt], num_rot1)
resize!(Minfoall_vec[tt], num_rot1)
for rr = 1:num_rot1
resize!(matchings_vec[tt][rr], num_tilt2)
resize!(Minfoall_vec[tt][rr], num_tilt2)
for tt2 = 1:num_tilt2
t_im2 = t[tt2]
if t_im2 == 1
num_rot1_2 = 1
else
num_rot1_2 = round(Int, num_rot_t2 * t_im2/2)
if rem.(num_rot1_2, 2) == 1.0
num_rot1_2 += 1
end
num_rot1_2 /= 2
end
resize!(matchings_vec[tt][rr][tt2], num_rot1_2)
resize!(Minfoall_vec[tt][rr][tt2], num_rot1_2)
end
end
end
```
I am getting this error:
> MethodError: no method matching resize!(::Type{Array{Any,1}}, ::Int64)
> Closest candidates are:
> resize!(::Array{T,1} where T, ::Integer) at array.jl:767
> resize!(::BitArray{1}, ::Integer) at bitarray.jl:825
> resize!(::Gtk.GtkWindow, ::Integer, ::Integer) at /home/subhankar/julia/JuliaPro-0.6.4.1/JuliaPro/pkgs-0.6.4.1/v0.6/Gtk/src/windows.jl:18
>
> Stacktrace:
> [1] macro expansion at ./In[32]:12 [inlined]
> [2] anonymous at ./:?
Can you suggest what I am doing wrong? Thanks!
---
### Author:  [@greg\_plowman](https://discourse.julialang.org/u/greg_plowman)
#### Post date: [August 19, 2018, 9:41pm UTC](https://discourse.julialang.org/t/vector-re-size/13733/2 "2018-08-19T21:41:10Z")
```julia
matchings_vec = [Vector{Any} for i in 1:num_tilt1]
Minfoall_vec = [Vector{Float64} for i in 1:num_tilt1]
```
These are defining vectors of types not instances.
---
### Author:  [@microlifecc](https://discourse.julialang.org/u/microlifecc)
#### Post date: [August 19, 2018, 9:55pm UTC](https://discourse.julialang.org/t/vector-re-size/13733/3 "2018-08-19T21:55:22Z")
Hi @greg_plowman. Thanks for the reply.
Can you please suggest what I should do?
Thanks!
---
### Author:  [@Nosferican](https://discourse.julialang.org/u/Nosferican)
#### Post date: [August 19, 2018, 10:51pm UTC](https://discourse.julialang.org/t/vector-re-size/13733/4 "2018-08-19T22:51:16Z")
Could you post a minimal complete verifiable example and what you would like to obtain?
---
### Author:  [@microlifecc](https://discourse.julialang.org/u/microlifecc)
#### Post date: [August 19, 2018, 11:01pm UTC](https://discourse.julialang.org/t/vector-re-size/13733/5 "2018-08-19T23:01:56Z")
Hi @Nosferican! Thanks for the help.
So basically I have found features in img1 and stored them in a vector of vectors **keys\_all1** indexed by tt and rr. Now I need to match them with the keypoints in img2 stored in **keys\_all2** indexed by tt2 and rr2. So I am looping over each of the values of tt, rr, tt2 and rr2 and then comparing the keypoints and storing them in matchings\_vec.
[Here’s](https://github.com/SubhankarGhosh/Affine-SIFT-Julia/blob/master/featureComputationAndComparison.ipynb) my work till date.
Thanks!
---
### Author:  [@greg\_plowman](https://discourse.julialang.org/u/greg_plowman)
#### Post date: [August 19, 2018, 11:45pm UTC](https://discourse.julialang.org/t/vector-re-size/13733/6 "2018-08-19T23:45:22Z")
> [@greg\_plowman](#):
>
> ```julia
> matchings_vec = [Vector{Any} for i in 1:num_tilt1]
> Minfoall_vec = [Vector{Float64} for i in 1:num_tilt1]
>
> ```
>
> These are defining vectors of types not instances.
Try this at the REPL:
```julia
d = Vector{Any}
typeof(d)
```
versus:
```julia
v = Vector{Any}()
typeof(v)
```
---
### Author:  [@microlifecc](https://discourse.julialang.org/u/microlifecc)
#### Post date: [August 20, 2018, 2:57am UTC](https://discourse.julialang.org/t/vector-re-size/13733/7 "2018-08-20T02:57:59Z")
> [@greg\_plowman](#):
>
> v = Vector{Any}() typeof(v)
Hi @greg_plowman. Thanks again!
So I edited my code like this:
```julia
matchings_vec = [Vector{Any}() for i in 1:num_tilt1]
Minfoall_vec = [Vector{Any}() for i in 1:num_tilt1]
```
And to create the internal vector structure like this:
```julia
for tt = 1:num_tilt1
t_tt = t[tt] #; t1 = t_tt; t2 = 1;
if t_tt == 1
num_rot1 = 1
else
num_rot1 = round(Int, num_rot_t2 * t_tt/2)
if rem.(num_rot1, 2) == 1.0
num_rot1 += 1
end
num_rot1 /= 2
end
#resize!(matchings_vec[tt], num_rot1)
matchings_vec[tt] = Vector{Any}(num_rot1)
#resize!(Minfoall_vec[tt], num_rot1)
Minfoall_vec[tt] = Vector{Any}(num_rot1)
for rr = 1:num_rot1
#resize!(matchings_vec[tt][rr], num_tilt2)
matchings_vec[tt][rr] = Vector{Any}(num_tilt2)
#resize!(Minfoall_vec[tt][rr], num_tilt2)
Minfoall_vec[tt][rr] = Vector{Any}(num_tilt2)
for tt2 = 1:num_tilt2
t_im2 = t[tt2]
#t_im2_1 = t_im2; t_im2_2 = 1;
if t_im2 == 1
num_rot1_2 = 1
else
num_rot1_2 = round(Int, num_rot_t2 * t_im2/2)
if rem.(num_rot1_2, 2) == 1.0
num_rot1_2 += 1
end
num_rot1_2 /= 2
end
#resize!(matchings_vec[tt][rr][tt2], num_rot1_2)
matchings_vec[tt][rr][tt2] = Vector{Any}(num_rot1_2)
#resize!(Minfoall_vec[tt][rr][tt2], num_rot1_2)
Minfoall_vec[tt][rr][tt2] = Vector{Any}(num_rot1_2)
end
end
end
```
I am getting this error:
> MethodError: Cannot `convert` an object of type Float64 to an object of type Array{Any,1} This may have arisen from a call to the constructor Array{Any,1}(…), since type constructors fall back to convert methods. Stacktrace: [1] Array{Any,1}(::Float64) at ./sysimg.jl:77 [2] macro expansion at ./In[32]:34 [inlined] [3] anonymous at ./\:?
Any suggestions please?
---
### Author:  [@greg\_plowman](https://discourse.julialang.org/u/greg_plowman)
#### Post date: [August 20, 2018, 3:20am UTC](https://discourse.julialang.org/t/vector-re-size/13733/8 "2018-08-20T03:20:32Z")
```julia
Vector{Any}(2)
```
versus
```julia
Vector{Any}(2.0)
```
If you put your code into a function, Julia will probably report the line number where the error occurs, and then you can see (or guess) what the problem is.
---
### Author:  [@microlifecc](https://discourse.julialang.org/u/microlifecc)
#### Post date: [August 20, 2018, 3:32am UTC](https://discourse.julialang.org/t/vector-re-size/13733/9 "2018-08-20T03:32:25Z")
Thanks @greg_plowman
That works.
Also do you think I should use:
`resize!(Minfoall_vec[tt][rr][tt2], num_rot1_2)`
or
`Minfoall_vec[tt][rr][tt2] = Vector{Any}(num_rot1_2)`
---
### Author:  [@appcypher](https://discourse.julialang.org/u/appcypher)
#### Post date: [August 20, 2018, 7:36am UTC](https://discourse.julialang.org/t/vector-re-size/13733/10 "2018-08-20T07:36:43Z")
> [@microlifecc](#):
>
> matchings\_vec = [Vector{Any} for i in 1:num\_tilt1] Minfoall\_vec = [Vector{Float64} for i in 1:num\_tilt1]
This won’t give you a nested structure BTW, it is going to result in a list of Vector{Any} and Vector{Float64}