Discussion :

[granbapt]

Bonjour,

J'espère ne pas être passé à côté de l'explication ailleurs dans ce forum...

Auparavant, j'ai déjà réussi à traduire un code MATLAB en C/C++ avec codegen, mais cette fois-ci ma fonction MATLAB contient un load non supporté par codegen (ce qui doit sûrement être la même chose pour d'autres fonctions de MATLAB du type str2num etc...).

Je n'ai pas très bien compris ce que préconise l'help dans ce cas là (il est question d'utiliser coder.extrinsic).

Si quelqu'un peut m'éclairer là-dessus, cela me serait bien utile !

Merci d'avance

[granbapt]

Mince alors ! Même pas un début de piste ?
Je pensais que mon problème était assez courant mais il semble être plus complexe que prévu.

Bon, je retourne à mes recherches et si je trouve une solution je la mets en ligne.

Si vous avez des suggestions, je suis toujours preneur

Bonne journée !

[Jerome Briot]

A quoi te sert la fonction LOAD dans ton code ?

[granbapt]

Le LOAD me sert à accéder à des valeurs contenues dans un fichier .txt

Je suppose qu'il existe un moyen faire cela directement en C mais mes connaissances sont très limitées dans ce domaine et il s'avère que j'aurai peut être le même problème pour des commandes comme num2srt ou length qui apparaissent plus loin dans mes programmes...

Si tu as une idée à me soumettre, je prends

Merci !

[shaiHulud]

Bonjour,

Je ne connais pas du tout codegen, mais je me dis que si load te sert uniquement à récupérer un fichier .txt (et non un .mat), tu dois pouvoir transformer ton load() en fscanf() ; et j'imagine que convertir fscanf en C sera plus facile.

De la même manière, num2str doit être transformable en sprintf().

Aucune idée pour length. Peut etre a remplacer par size()

[Jerome Briot]

Il faudrait nous en dire plus sur le contenu de ce fichier txt et sur les valeurs que tu souhaites extraire de ce fichier.

[granbapt]

Merci pour vos réponses rapides !

@VV33D : je garde en tête l'idée du fscanf() et du sprintf(), en revanche, je crains que length et size soient du même acabit... mais bon je vais tester on verra

@ Dut : en effet, au temps pour moi, il s'agit de tableaux de doubles (de taille 160*320). Pour info il s'agit de données atmosphériques et de coordonnes géographiques en latitude et longitude, mais je ne sais pas si cela t'intéresse vraiment , je pense que c'est plutôt la nature du contenu qui était l'objet de ta remarque...

[Jerome Briot]

Montre nous quelques lignes de ce fichier.

[granbapt]

Voici un premier type de données :

Code :

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Et un second :

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

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[Jerome Briot]

Dans un premier temps, comme suggéré par VV33D, tu peux essayer comme ceci :

Code :

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fid = fopen('data.txt','rt');
    X = fscanf(fid,'%f',[240,inf]).';
fclose(fid);

Il faut bien entendu remplacer le 240 par le nombre de colonnes du fichier réel (cette valeur correspond au premier exemple que tu nous a montré)

Tu devrais normalement utiliser ceci :

Code :

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fid = fopen('data.txt','rt');
    X = fscanf(fid,'%f',[320,160]).';
fclose(fid);

[granbapt]

Merci !
Je vais me pencher là dessus.

[granbapt]

Bon, la piste semble bonne mais c'est pas encore tout à fait ça car cette fois-ci c'est fopen() qui n'est pas supportée...sacré MATLAB

Allez, je continue de chercher !

[tug83]

MATLAB Coder ne supporte pas bcp de fonctions usuelles en effet
Il faut donc taper:

Code :

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coder.extrinsic('fopen','load')

par exemple pour la génération de code fonctionne.