CODEWITHSUNDEEP
matlabindexingoctavecell-array
Flama
Flama

Reputation: 868

Saving array in file and then loading it in Octave? Error: struct cannot be indexed with {

I get the error

 struct cannot be indexed with {' in Octave.

What I'm trying to do is to save an array in a file by doing:

save myfile.mat initialW

The array seems to be saved ok in the file. Now I want to load it, so I wrote:

numberOfHiddenLayers = length(hiddenLayers);
w = cell(numberOfHiddenLayers + 1, 1);
w = load("myfile.mat");

However this doesn't seem to work. Any help?

myFile.mat looks like this:

# Created by Octave 5.1.0, Sat May 11 23:56:06 2019 GMT <unknown@DESKTOP-4LP8KO2>
# name: initialW
# type: global cell
# rows: 3
# columns: 1
# name: <cell-element>
# type: matrix
# rows: 8
# columns: 3
 0.11396577078177994 -0.35348554375077296 -0.075606765835858347
 -0.57613421825993738 -0.54574495840109649 -0.094554469152263232
 -0.31746528997142315 -0.46945201018320487 -0.119175071441675
 -0.23112104844315234 -0.015682264154657233 0.34987783444013509
 -0.087880331273064327 -0.19609313736912465 -0.08929095997252362
 -0.080653681379305231 0.024968754990479569 0.24949668431650684
 -0.57498895224664437 0.29920144551430461 -0.50083852142549268
 -0.3961249607134249 0.25330869897866082 0.25478925191660773


# name: <cell-element>
# type: matrix
# rows: 8
# columns: 9
 0.0037531259407581619 0.43063491636241652 -0.15445269549506291 0.47739161602226637 0.22753868435063779 -0.020492674304004144 -0.057513893868040733 -0.059060562491990765 -0.25706911999311255
 -0.29424894306440108 0.38336286612135578 -0.16776741033203713 0.46943337027631832 0.13408640078121992 -0.31554901391689794 0.35099674273923137 -0.091832499829088587 0.30933982744981386
 0.52316428666987069 0.27341366734288147 0.51082650460372281 0.49809576149309504 0.37444903641719957 0.38334119916001402 0.42842076982657767 -0.24217696807363465 0.28086557806980544
 -0.073322311691991215 0.63483655613700107 0.27533329919913868 -0.048081459516434499 -0.2267065362144246 0.64395424194737783 0.58767652657219105 0.41793542891042484 0.63321069992358114
 0.65763013238306822 0.02860044065789058 -0.011829632755802955 0.22009594392084614 -0.26511909072695583 0.57370613947506088 0.11415461587493758 0.10573792459512454 -0.32427434895492757
 0.0089604833881801182 -0.073811064790883618 -0.20709124889541619 -0.036291825999526517 0.52062296154868948 -0.011081755811460203 -0.31768168116882467 0.60905440138955669 0.17623419475038399
 -0.27776341169684216 0.61262393897374579 0.065512487276322307 -0.047081972124068172 0.55430062047934725 -0.33326753953006594 0.23202447961516875 0.17662506269733375 0.34004162952881817
 -0.046484818259064919 -0.32230299619629554 0.18841716283341831 -0.18689054271483652 0.026911300930141047 0.58017623550299824 0.12685162090341895 0.29067778228781277 0.56684018254895219


# name: <cell-element>
# type: matrix
# rows: 1
# columns: 9
 0.40736020065140749 0.31486116916450352 0.085860186186408449 -0.10247723839970202 -0.14917985837470693 0.65015717261764294 -0.1038654730028068 0.38554195073868397 -0.039542106657368348

Upvotes: 0

Views: 700

Answers (1)

Mad Physicist
Mad Physicist

Reputation: 114230

When you load a mat-file with a single output argument, it loads the data into a struct with fields that are the names of your variables. w is a struct with field initialW after you call load.

When you assign to a variable without any indexing expression on the left hand side, you discard the previous value. So the cell array your started with is simply overwritten by the struct.

You can do either

w = load(...);
w = w.initialW;

Or, if you want to use the cells:

w = cell(...);
iw = load(...);
w{1:length(iw.initialW)} = iw.initialW;

Upvotes: 2

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